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ECOflo
Temperature Selection Procedure
Auto-Ignition Addendum
THIS ADDENDUM ONLY APPLIES TO “B” SERIES
This manual must be kept with the appliance October 2012
Part No E864 Addendum
High Efficiency Condensing Storage Water
Heaters for Natural Gas and Propane (LPG)
EC230/600, EC230/700, EC230/960, EC380/740,
EC380/980, EC380/1220, EC380/1400, EC380/1900
LEC230/600, LEC230/700, LEC230/960, LEC380/740,
LEC380/980, LEC380/1220, LEC380/1400, LEC380/1900
°
°°
°
°
2
T
o Increase Setpoint Temperature
Step 1: Depress and hold “Temperature Up” button until desired setpoint temperature appears in the display.
Step 2: “Setpoint” indicator begins flashing in the display after pressing “Temperature Up” button.
Step 3: Press “SET” button for new setting to take effect immediately. “Setpoint” will stop flashing. If the “SET” button is
not pressed, the new temperature setting will take effect in approximately 10 seconds.
SELECT SET
S
tatus
°F
i
dle
O
perational
Step 1
S
ELECT SET
S
tatus
°F
i
dle
setpoint
O
perational
Step 2
"Setpoint"
flashes
SELECT SET
Status
°F
idle
setpoint
Operational
Press SET Button for setting to
to take effect immediately
Step 3
"Setpoint" flashes
for 10 seconds
3
T
o Decrease Setpoint Temperature
S
tep 1: Depress and hold “Temperature Down” button until desired setpoint temperature appears in the display.
Step 2: “Setpoint” indicator begins flashing in the display after pressing “Temperature Down” button.
Step 3: Press “SET” button for new setting to take effect immediately. The setpoint will stop flashing. If the “SET” button
is not pressed, the new temperature setting will take effect in approximately 10 seconds.
SELECT SET
Status
°
F
idle
Operational
Step 1
SELECT SET
S
tatus
°F
idle
setpoint
Operational
"Setpoint"
flashes
Step 2
SELECT SET
Status
°F
idle
setpoint
Operational
"Setpoint" flashes
for 10 seconds
Press SET for setting to
take effect immediately
Step 3
4
To Change Temperature Format in Display from F to C or C to F:
Step 1: Press “SELECT” button until F/ C is displayed.
Step 2: Press “SET” button to change temperature format. Symbol F/ C will flash.
Step 3a: Press “Temperature Up” button to change temperature format to C.
SELECT SET
Status
°C
idle
Operational
Step 3a
°F/°C
°F/°C Flashes
Changes to "°C"
S
ELECT SET
Status
idle
Operational
Press select
Step 1
°F °F/°C
S
ELECT SET
Status
idle
O
perational
Step 2
°F/°C Flashes
°
F°F/°C
5
S
tep 3b: Press “Temperature Down” button to change temperature format toF.
Step 4: Press “SET” button to confirm ˚F or ˚C format. F/ C will stop flashing. Setpoint display will appear in the format
selected (˚F or ˚C) in 10 seconds.
Step 5: Pressing “SELECT” button will return display to setpoint in format selected (˚F or ˚C) immediately.
SELECT SET
Status
°
F
i
dle
O
perational
Step 4
Press Set
°
F/°C
Symbol "°F/°C" Stops Flashing
SELECT SET
Status
°
F
idle
Operational
Step 3b
°
F/°C
°F/°C Flashes
C
hanges to "°F"
SELECT SET
Status
°F
idle
Operational
Press select
Step 5
Setpoint shown in °F
6
An automatic gas shut-off device (ECO) is incorporated in the sensor and control board which will shut off all gas supply
t
o the burner and pilot if the water heater temperature exceeds 200°F
S
hould the ECO function (open), the water
temperature should be reduced to approximately 120°F and follow applicable Lighting Instructions to place the
water heater in operation. The water heater must have the problem corrected by a qualified service person before putting
the water heater back in operation. It is recommended that all service work be performed by a qualified service agency.
I
f the water heater is to remain idle for 30 days or more or is subjected to freezing temperatures while shut off, the water
h
eater and piping should be fully drained (See “To Drain the Water Heater”) and the drain valve should be left fully open.
Burner Flame Check
At the time of installation and at periodic intervals (about every 3 months), a visual check of the pilot and burner flames
should be made to determine if they are burning properly. No adjustment to the air shutter should be required for this
heater The burner flames should be blue with yellow tips. A blue-orange flame is characteristic of operation on liquefied
petroleum (LP) gas. If the burner flame does not appear as described, an air shutter adjustment may be required. The
burner tube flames should light smoothly from the pilot.
Figure 8
Hydrogen gas can be produced in an operating water heater that has not had water drawn from the tank for
a long period of time (generally two weeks or more). Hydrogen gas is extremely flammable.
To prevent the
possibility of injury under these conditions, we recommend the hot water faucet to be open for several
minutes at the kitchen sink before you use any electrical appliance which is connected to the hot water
system. If hydrogen is present, there will be an unusual sound such as air escaping through the pipes as
hot water begins to flow. Do not smoke or have open flame near the faucet at the time it is open.
WARNING
Water heaters are heat producing appliances. To avoid damage or injury there shall be no materials stored against
the water heater or vent system, and proper care shall be taken to avoid unnecessary contact (especially by
children) with the water heater and vent system. UNDER NO CIRCUMSTANCES SHALL FLAMMABLE
MATERIALS, SUCH AS GASOLINE OR PAINT THINNER BE USED OR STORED IN THE VICINITY OF THIS
WATER HEATER, VENT SYSTEM OR IN ANY LOCATION FROM WHICH FUMES COULD REACH THE WATER
HEATER OR VENT SYSTEM.
WARNING
IMPORTANT- In the event of an emergency, turn off the gas and electric (if applicable) to the appliance.
IMPORTANT- The water heater should be inspected at a minimum annually by a qualified service technician
for damaged components and/or joints not sealed. DO NOT operate this water heater if any part is found
damaged or if any joint is found not sealed
NOTICE
7
SECTION X: MAINTENANCE
The following maintenance should be performed by a qualified service technician at the minimum periodic intervals
suggested below. In some installations, the maintenance interval may be more frequent depending on the amount of use
a
nd the operating conditions of the water heater. Regular inspection and maintenance of the water heater will help to
insure safe and reliable operation.
1. Annual checks of the ignition systems (millivolt and electronic), temperature controls and any other water heater
controls are necessary to ensure proper operation. Also, all safety shut-off valves must be checked to verify proper
operation and tightness.
2. The flow of combustion and ventilation air MUST NOT be restricted. Clear the combustion air openings of any dirt,
dust, or other restrictions. WARNING! The combustion ventilation system may be HOT.
3. At all times keep the water heater area clear and free from combustible materials, gasoline and other flammable
vapors and liquids.
4. Bi-annually conduct a visual check of the pilot and burner flames to determine that they are burning properly. See
“Burner Flame Check” section for example of proper burner flame pattern.
5. Annually remove the main burner rack assembly to clean orifices and related parts of any dirt or other foreign
material. Inspect the burner ports for obstructions or debris and clean with a wire brush, vacuum, or use a mild
detergent solution to clean as needed. NOTE: It is imperative for proper operation of the water heater that the main
burner rack be replaced in the original location.
6. At least once a year, check the combination temperature and pressure relief valve to insure that the valve has not
become encrusted with lime. Lift the lever at the top of the valve several times until the valve seats properly without
leaking and operates freely.
7. Monthly drain off a gallon of water to remove silt and sediment. WARNING! This water may be HOT.
8. All models are equipped with a cleanout opening to aid in removal of hard water deposits from the tank bottom. If
this water heater operates under hard water conditions, the following should be performed at least every 3 months:
Drain the water heater. Remove the cleanout jacket cover and tank cover. When cleaning the tank, care must be
taken to avoid trying to break deposits loose as this could damage the glass lining and shorten the life of the water
heater. After cleaning, replace the cleanout tank cover and jacket cover, and refill with water.
9. A sacrificial anode rod has been installed to extend tank life. The anode rod should be inspected annually (every
year) and replaced when necessary to prolong tank life. Water conditions in your area will influence the time
interval for inspection and replacement of the anode rod. Contact the plumbing professional who installed the water
heater or the manufacturer listed on the rating plate for anode replacement information. The use of a water softener
may increase the speed of anode consumption. More frequent inspection of the anode is needed when using
softened (or phosphate treated) water.
10. The venting system must be inspected at least once a year to ensure against leakage of exhaust products.
IMPORTANT- If the combination temperature and pressure relief valve on the appliance discharges periodically, this
may be due to thermal expansion in a closed water supply system. Contact the water supplier or local plumbing
inspector on how to correct this situation. Do not plug the combination temperature and pressure relief valve outlet.
NOTICE
FOR YOUR SAFETY, DO NOT ATTEMPT REPAIR OF COMBINATION GAS CONTROL, BURNERS OR GAS
PIPING. REFER REPAIRS TO A QUALIFIED SERVICE TECHNICIAN.
CAUTION
When lifting lever of the combination temperature and pressure relief valve, hot water will be released under
pressure. Be careful that any released water does not result in bodily injury or property damage.
Keep clear of the combination temperature and pressure relief valve discharge line outlet. The discharge
may be hot enough to cause scald injury. The water is under pressure and may splash.
WARNING
8
ACCESSING SERVICE MODE ON THE WATER HEATER DISPLAY (FOR SERVICE PERSONNEL ONLY)
The display has a “service mode” for changing the maximum setpoint and accessing information in aiding servicing of the
water heater. This procedure is for service and installation personnel only. To enter the Service Mode, follow the steps
i
llustrated below:
Step 1: Press “Select” and “Temperature Up” buttons together and hold for 3 seconds until “Max Setpoint” is shown in the
display.
Step 2: Pressing “Select” button will change display to next mode
SELECT SET
Status
°F
idle
Operational
Wate
r
Temp
S
ELECT SET
S
tatus
idle
Operational
"Max Setpoint"
next to Temperature
Setpoint value
M
ax
Setpoint
The following procedure is for service and installation personnel only. Resetting lockout conditions
without correcting the malfunction can result in a hazardous condition.
WARNING
30 Seconds after the last button press, the display will automatically return to the “User Mode”. Simultaneously
pressing the “Select” and “Temperature Up” buttons will switch the display immediately to the “User Mode”.
NOTICE
9
T
he following is the sequence of modes available in “Service Mode” by pressing the “Select” button:
Error Code Number (Display/Reset). This is only shown if there is an operating error in the “User Mode”.
1. Max Setpoint (Display/Change)
2a. Water Temperature Average (Displays average if there are two sensors – sensor temperature displayed if single
sensor is used).
SELECT SET
Status
°F
idle
Water Temp
Operational
SELECT Lock out RESET
S
tatus
Service Needed
Error Code Shown
in Water Heater Display
SELECT SET
Status
°
F
idle
O
perational
Max Setpoint value
Water Heater Display
M
ax
Setpoint
10
2b. Water Temperature - Upper Sensor (Displays if there is an upper sensor – some models)
2c. Water Temperature - Lower Sensor (Displays if there are two sensors)
3. Flame Current of Pilot Flame Sensor (Displays only in the Heating Cycle)
SELECT SET
Status
Heating
Operational
Flame Current
µA
SELECT SET
Status
°F
idle
O
perational
U
pper Senso
r
S
ELECT SET
Status
°F
idle
Operational
L
ower Senso
r
11
4. Setpoint (Display/Change)
5. ˚F/˚C (Display/Change)
6. Differential (Display only – shows the differential of the thermostat)
SELECT SET
Status
°F
idle
Differential
Operational
SELECT SET
Status
°
F/C°
i
dle
O
perational
°
F
SELECT SET
Status
°F
idle
s
etpoint
O
perational
12
7. Software Version (Display only)
8. Error Code History (Displays if there are present error codes or up to 10 previous error codes). Water Heater Display
will show -- if there are no error codes.
To change the Maximum Setpoint Limit (Max Setpoint) for the temperature setpoint:
Step 1: In service mode press the “Select” button until “Max Setpoint” is displayed.
SELECT SET
Status
i
dle
Operational
S
oft
SELECT SET
Status
°F
idle
Max
Operational
Setpoint
S
ELECT SET
Status
i
dle
O
perational
No current error codes
Setting the water temperature to the maximum set point can result in scalding hot water delivered to the taps. It
is highly recommended that the maximum setpoint be adjusted to the lowest temperature possible for the needs of
the installation. See following section to change the maximum setpoint limit (max setpoint). Make sure the water
heater control display is not in a public area that can result in the temperature settings being improperly adjusted.
See previous warning on scalds and an ASSE approved mixing valve.
WARNING
13
Step 2: Press “Set” button to enter setting mode. “Max Setpoint” will flash to indicate setting mode.
Step 3: Press the “UP” or “DOWN” buttons to change the maximum setpoint value. This will limit the maximum setpoint
the user can select. Note: The maximum setpoint is approximately 180˚F.
Step 4: Press “Set” button to confirm new “Max Setpoint” value and stop setting mode.
SELECT SET
Status
°F
idle
Operational
M
ax
S
etpoint
"Max Setpoint" Flashes
SELECT SET
Status
°F
idle
Operational
Max
Setpoint
"Max Setpoint" continues to flash
while making adjustments
SELECT SET
Status
°F
idle
Operational
Max
Setpoint
"Max Setpoint" stops flashing
14
Step 5: 30 Seconds after the last button press, the Water Heater Display will go back to “User Mode”. It will read “Max
S
etpoint” without showing a temperature value if the temperature setpoint is at the maximum setting. The Water Heater
Display can be set back to the “User Mode” immediately by pressing both the “Temperature Up” and “Select” buttons
together for 3 seconds.
Display of Water Temperature:
Step 1: In Service Mode, Press the “Select” button until “Water Temp” is displayed in the upper right section of the water
heater display. For water heaters using two temperature sensors in the tank, this will be the average reading between the
two sensors. For water heaters using a single sensor, this is the reading for the sensor.
SELECT SET
S
tatus
idle
Operational
Max
S
etpoint
Exiting Service Mode
SELECT SET
Status
°
F
i
dle
O
perational
Wate
r
Temp
15
Step 2: For water heaters using two temperature sensors, pressing the “Select” button again displays the Upper Sensor
t
emperature reading. “Upper Sensor” will be displayed in the lower right side of the status window of the water heater
display.
Step 3: For water heaters using two temperature sensors, pressing the “Select” button again displays the Lower Sensor
temperature reading. “Lower Sensor” will be displayed in the lower left side of the status window of the water heater
display.
To Display Flame Sense Current of the Pilot Flame Sensor:
The pilot flame sense current is available only when the burners are in operation. Step 1: Make sure the status displays
“Heating” or draw enough hot water to start the burners. Step 2: Enter the “Service Mode” described previously. Step 3:
Press the “Select” button until a number value is displayed with “Flame Current” to the right of the number. The value
displayed is in microamps (µA).
S
ELECT SET
S
tatus
°F
i
dle
O
perational
L
ower Sensor
SELECT SET
Status
Operational
Flame
Current
Heating
µA
SELECT SET
Status
°
F
i
dle
Operational
Upper Sensor
16
To Display and Change Temperature Setpoint:
Step 1: In “Service Mode” press the “Select” button until “Setpoint” is shown in the water heater display.
Step 2: Press the “Set” button to enter the setting mode. “Setpoint” will flash in the water heater display.
Step 3: To raise the temperature setpoint, press the “Temperature Up” button until the desired temperature is shown on
the water heater display.
SELECT SET
Status
°
F
i
dle
setpoint
O
perational
S
ELECT SET
Status
°
F
i
dle
s
etpoint
Operational
"Setpoint" Flashes
SELECT SET
Status
°F
idle
setpoint
Operational
"Setpoint" Flashes
Note: The maximum temperature that can be set in the Water Heater Display is limited to the “Max Setpoint”
described previously. To change the “Max Setpoint”, refer to the procedure “To Change the Maximum Setpoint
Limit…” described previously under “Accessing the Service Mode on the Water Heater Display”.
NOTICE
17
Step 4: To lower the temperature setpoint, press the “Temperature Down” button until the desired temperature is shown
o
n the water heater display.
Step 5: When the desired setpoint is reached on the water heater display, press the “Set” button to confirm the new
setpoint. “Setpoint” stops flashing in the water heater display.
To Display and Change Temperature Format (
F/ C):
To Change Temperature Format in Display from F to C or C to F:
Step 1: While in “Service Mode”, press “Select” button until “˚F/˚C” is shown in the upper right portion of the water heater
display.
SELECT SET
Status
°F
idle
s
etpoint
Operational
"Setpoint" Flashes
S
ELECT SET
Status
°F
idle
setpoint
O
perational
"Setpoint" Stops Flashing
SELECT SET
Status
idle
Operational
°F °F/C°
18
S
tep 2: Press “Set” button to change temperature format. “˚F/˚C” symbol will flash in the water heater display.
Step 3a: Press “Temperature Up” button to change temperature format to ˚C.
Step 3b: Press “Temperature Down” button to change temperature format to ˚F.
SELECT SET
Status
idle
Operational
°F °F/C°
"°F/°C" Flashes
SELECT SET
S
tatus
idle
Operational
°
C
Changes to "°C"
°
F/C°
"°F/°C" Flashes
SELECT SET
Status
idle
Operational
°F
Changes to "°F"
°F/C°
"°F/°C" Flashes
19
Step 4: Press “Set” button to confirm ˚F or ˚C format. ˚F/˚C will stop flashing.
Step 5: Pressing “Select” button will return display to setpoint in format selected (˚F or ˚C) immediately.
SELECT SET
S
tatus
°F
idle
Operational
Lower Sensor
Setpoint shown in °F
SELECT SET
Status
°F
idle
Operational
°F °F/C°
"°F/°C" Symbol Stops Flashing
20
How to reset the control from Lockout Conditions:
If an error code is displayed (except for #4, low flame sense current), the water heater will be in a “lockout condition” with
the water heater display showing the error code number and “Service Needed” in the status section of the display
window. Error codes 62 (maximum number of retries detected) and 63 (maximum number if ignition recycles detected)
are “Soft Lockouts” in which the control can be reset in the “User Mode” by pressing the lower right button under “Lockout
Reset” shown in the lower right portion of the display. The control will also go through 3 attempts to relight the burners
every hour in the soft lockout condition.
Resetting Error Codes in Soft Lockout Condition
All other error codes will put the water heater into a “Hard Lockout” condition, in which the water heater will not operate
and cannot be reset in the “User Mode”. To reset a hard lockout, first enter the “Service Mode” described earlier by
pressing both the “Temperature Up” and “Select Buttons” at the same time for 3 seconds. Then press the lower right
button under “Lockout Reset” in the water heater display and hold for 3 seconds.
Lockout RESET
S
ELECT
Status
S
ervice needed
Error Code Shown in
Water Heater Display
Press for 2 seconds
SELECT SET
Status
Service Needed
SELECT Lockout RESET
Status
Service Needed
Error Code Shown in
Water Heater Display
Step 1: Press for 3 seconds
to enter service mode.
Step 2: Press for 3 seconds to
reset control in service mode.
Resetting Error Codes in Hard Lockout Condition
The following procedure is for service and installation personnel only. Resetting lockout conditions without
correcting the malfunction can result in a hazardous condition.
WARNING
21
E
rror Codes and Error History Display:
If there is an operating problem with the water heater, an error code number will appear on the water heater display with
“Service Needed” to the right of the “Status” indicator. The error code label is located below the water heater display and
t
he following section in this Installation and Operating Instruction Manual explains the error codes with corrective actions
t
o repair the water heater.
Example of Error Code in the Display:
Error Code History:
In “Service Mode” pressing the “Select” button after the “Software Version” (item 8 in the previously described sequence
of service modes) will show an error code history, if there have been any previous operating problems with the water
heater. If the display shows --, there is not a current error code.
The Water Heater Display will provide up to 10 previous error codes. The oldest error code will be stored in code index
#1 and the most recent in code index #10 (if there are 10 error codes).
To view previous error codes:
Step 1:
In “Service Mode” press the “Select” button until the next display after the “Software Version”. If there are no current error
codes, the display will show -- .
S
ELECT SET
idle
S
ervice Needed
SELECT SET
Status
°F
idle
Operational
No Current Error Code
22
Step 2:
Press the “Temperature Down” button to select the error code index, starting with the most recent error code “10”.
Step 3:
Press the “Select” button to view the error code for “code 10”. If there is a number displayed, note what the number is.
The label next to the water heater display will identify the code number. If no number is displayed with only a “--“ in the
water heater display, then there has not been an error code for error code index 10.
SELECT SET
S
tatus
i
dle
Operational
Error Code Index
SELECT SET
Status
idle
Operational
No Error Code Shown
for Code Index 10
23
Step 4:
Press the “Temperature Down” button to change to the previous code index, code #9.
Step 5:
Press the “Select” button for code index #9 to view if there are any code numbers.
SELECT SET
S
tatus
i
dle
Operational
Error Code Index
S
ELECT SET
S
tatus
i
dle
O
perational
Stored Error Code
For Code Index #9
24
Step 6:
C
ontinue pressing the “Temperature Down” button to change to the next error code index and press “Select” to view the
error code number, if any, for that index number. Continue on to index #1, the oldest error code index. The water heater
display will store up to 10 error codes with the oldest code starting in code index #1 with the most recent code in code
i
ndex #10.
Step 7: 10 seconds after the last button press, the Water Heater Display will revert back to the current error code display.
To exit Service Mode, either wait 30 seconds or press Temperature Up button and Select Button for 3 seconds.
DIAGNOSTIC ERROR CODES AND TROUBLESHOOTING PROCEDURES FOR HONEYWELL INTEGRATED
CONTROLS (24 VOLT FLUE DAMPER MODEL SERIES)
Error
Code
Definition of Code Cause of Problem and Actions Taken to Correct
4
Low Flame Sense
Current
Determine flame sense current in the Service Mode with the water heater
operating. If less than 1.0 microamps, check pilot flame sense rod and wire.
Clean flame sense rod with emery cloth. If problem is not solved, replace
pilot.
55
Damper End Switch
Failed to Close
(Stuck Open)
Check to see if flue damper has fully opened. If not, disconnect damper
harness at damper plug connection and check for 24 volts between pins on
red and white wires. If no voltage, check wire harness or measure output on
control board (pins 1&4). If there is no voltage at the control board, replace
control. Replace wire harness if voltage does not pass to the pin terminals
from the control. If there is 24 volts at flue damper connection, replace flue
damper. If damper is open, disconnect harness and check continuity
between pins from black and yellow wires on flue damper. If no continuity,
replace flue damper.
56
Damper End Switch
Failed to Open (Stuck
Closed)
Check to see if flue damper has fully closed. If not, disconnect damper
harness at damper plug connection and check for 24 volts between pins on
red and white wires. If no voltage, check wire harness or measure voltage
output on control board (pins 1&4). If there is no voltage at the control
board, replace control. Replace wire harness if voltage does not pass to the
pin terminals from the control. If there is 24 volts at flue damper connection,
replace flue damper. If damper is closed, disconnect harness and check
continuity between pins from black and yellow wires on flue damper. If there
is continuity, the end switch is stuck closed. Replace flue damper.
S
ELECT SET
S
tatus
°F
idle
s
etpoint
Operational
Exiting Service Mode
25
Error
Code
Definition of Code Cause of Problem and Actions Taken to Correct
6
Flame Sensed Out of
Normal Sequence
(Before Opening Gas
Valve or After Closing
G
as Valve)
Check to make sure gas valve has closed. No voltage should be present at
the gas valve before or after ignition cycle. Make sure wire positions on the
wire harness are correct. If gas valve is stuck open, replace.
23
Flame Detected
Before Ignition
Check to make sure gas valve has closed. No voltage should be present at
the gas valve before the ignition cycle. Make sure wire positions on the wire
harness are correct. If gas valve is stuck open, replace.
24
Flame Detected After
Heating Cycle
C
ompletes
Check to make sure gas valve has closed. No voltage should be present at
t
he gas valve before the ignition cycle. Make sure wire positions on the wire
harness are correct. If gas valve is stuck open, replace.
31
Upper Sensor
Readings Faulty
Resistance of upper sensor out of operating range. Check continuity of wire
harness to upper sensor, and if O.K., replace upper sensor.
32
Lower Sensor
Readings Faulty
Resistance of lower sensor out of operating range. Check continuity of wire
harness to lower sensor, and if O.K., replace lower sensor.
57
Flame Rod Shorted
to Ground
Pilot flame sensor rod is shorted to ground. Check to see if flame sensor
wire has bare spots touching metal parts of if flame sensor rod is touching
the pilot shield or other metal parts. Replace pilot if flame sense wire is
damaged or flame rod is bent.
58
AC Line Frequency
Error – Signal Too
Noisy or Frequency
Incorrect
Check line voltage frequency to the water heater. Determine if there are
wide fluctuations. Call an electrician if the problem persists. The water
heater should be on a separate line.
59
Line Voltage Too Low
or High
Check line voltage to the water heater. Determine cause of low or high
voltage. Call an electrician or your utility. The water heater should be on a
separate line.
61
DC Output Voltage
Unstable
Check line voltage to the water heater for erratic readings. Also check
wiring to make sure there are no shorts. If power supply and wiring is O.K.,
replace control board.
62
Maximum Number of
Retries Detected
Pilot is either not lighting or not staying lit during the ignition cycle. Check
inlet gas pressure for minimum pressure on rating label. Is pilot electrode
sparking? Check gas valve wire harness for broken wires or shorts. If 24
volts is present between PV and PV/MV terminals at the gas valve, replace
gas valve. Check for voltage output to the yellow and red gas valve wires on
the control board pins. If during the ignition trial period, there is no voltage
present at the control board pin terminal for the red and yellow wires leading
to the gas valve, then replace the control board. Replace pilot if wires are
damaged or electrode is damaged.
63
Maximum Number of
Ignition Recycles
Detected
Pilot flame is lost during run cycle, then reestablished on ignition cycle.
Check inlet gas pressure. Is gas pressure dropping below the minimum
operating pressure on the rating label after the main gas valve opens? Is
the gas pipe size to the water heater adequate? Check the pilot shield
position and condition of the burners. Clean or replace as needed. Check
the pilot flame and observe the microamp output on the run cycle. Check
the pilot tubing to the pilot and replace if crimped or damaged. Replace pilot
if wires, flame sensor, or electrode is damaged.
64 Electronics Failure Replace control board.
65
High Water
Temperature (Over
200˚F)
Water temperature in tank has exceeded 200˚F. Check lower sensor. Make
sure sensor is fully inserted into the well (clip on sensor wire secures sensor
in place). Check lower and upper (where used) sensor readings. If not
within specifications, replace sensor. If sensor and wire harnesses check
O.K., replace control board.
26
Procedure for Checking Thermostat Sensors
Set the thermostat above water temperature (See temperature adjustment section) and observe system through one (1)
complete cycle. Make sure system operates as desired.
To check the upper sensor or lower sensor assembly, compare the resistance of the sensor terminals (blue leads for
upper sensor, yellow and black lead for lower sensor) as measured by an ohmmeter to the water temperature as
measured by an accurate thermometer. Thermistor resistance increasesasthetemperature decreases. The tables
below show the correct sensor resistance at various temperatures. Replace the sensor if the ohm reading in the chart
does not approximate the reading from the sensor at the temperature measured in the tank.
In Degrees F
°F 0 1 2 3 4 5 6 7 8 9
4
0 26109 25400 24712 24045 23399 22771 22163 21573 21000 20445
50 19906 19383 18876 18383 17905 17440 16990 16553 16128 15715
60 15314 14925 14548 14180 13823 13477 13140 12812 12494 12185
70 11884 11592 11308 11032 10763 10502 10248 10000 9760 9526
80 9299 9078 8862 8653 8449 8250 8057 7869 7685 7507
90 7333 7165 7000 6839 6683 6531 6383 6238 6098 5961
100 5827 5697 5570 5446 5326 5208 5094 4982 4873 4767
110 4663 4562 4464 4368 4274 4183 4094 4006 3922 3839
120 3758 3679 3602 3527 3453 3382 3312 3244 3177 3112
130 3048 2986 2925 2866 2808 2752 3697 3643 2590 2538
140 2488 2439 2391 2344 2298 2253 2209 2166 2124 2083
150 2043 2004 1966 1928 1891 1856 1820 1786 1753 1720
160 1688 1656 1625 1595 1566 1567 1509 1481 1454 1427
170 1402 1376 1351 1327 1303 1280 1257 1235 1213 1191
180 1170 1150 1129 1110 1090 1071 1053 1035 1017 999
190 982 965 949 933 917 901 886 871 857 842
200 828 814 801 788 775 762 749 737 725 713
In Degrees C
°C 0 1 23456789
0 32648 31026 29495 28049 26682 25389 24166 23010 21915 20879
10 19898 18968 18088 17253 16461 15710 14998 14322 13680 13071
20 12492 11942 11419 10922 10450 10000 9572 9165 8778 8409
30 8057 7722 7403 7099 6808 8532 6268 6016 5775 5546
40 5327 5117 4917 4726 4543 4368 4201 4042 3889 3742
50 3602 3468 3340 3217 3099 2986 2878 2774 2675 2579
60 2488 2400 2316 2235 2157 2083 2011 1942 1876 1813
70 1752 1693 1637 1582 1530 1480 1432 1385 1340 1297
80 1256 1216 1177 1140 1105 1070 1037 1005 974 944
90 916 888 861 835 810 786 763 741 719 698
27
Baxi Commercial Division
Wood Lane, Erdington,
Birmingham B24 9QP
Email: andrews@baxicommercialdivision.com
www.andrew swat erheate rs.co.uk
Publication Date:1012
Sales:
0845 070 1056
Technical:
0845 070 1057
0087
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