Honeywell Hm506h8908, Hm512, Hm509 Service Manual

69-2144-03

No. of
Red
Light
Blinks

3 Failure to

4 Heating

5 Input voltage

TROUBLESHOOTING

Fault
Description

ll tank with

water.

element
overheated.

insufcient.

Steps to Fix
To be Performed by Professional
HVAC Technician Only

• Ensure inlet water is on.

• Check for leaks around the tank
seal and solenoid valve.

• Turn off water supply and
replace in-line water filter.

• Press/hold RESET button until
the red Call Service light turns
off.

• If tank still fails to fill, press and
hold the EMPTY button for 3
seconds (if unit fails to drain,
unplug unit and make sure water
in tank is cool).

• Follow tank cleaning instructions
in the Professional Installation
Guide. Ensure you have a firm
grip of the tank prior to releasing
the tank, especially if water is
present.

• Clear any excess debris from
the tank’s bottom orifice to the
solenoid valve.

• Reassemble tank and plug unit
back in. Press the RESET button.

• If water still fails to flush into the
tank, replace the solenoid valve.

• Press and hold the EMPTY
button for 3 seconds.

• Follow tank cleaning steps in the
Professional Installation Guide.

• Reassemble tank and press the
RESET button.

• If fault returns, replace with
applicable unit.

• Problem most likely due to
voltage variation from service
provider, or faulty wiring in
the home. If problem is due to
TrueSTEAM service alone, the
fault should correct itself when
voltage levels return to normal.

• Press and hold the RESET button
until CALL SERVICE light shuts off.

• Initiate a humidistat call for
humidity and monitor for fault
light to return.

• If fault returns, check the line
cord input voltage before and
during humidistat call. Line
voltage should not drop below
102Vrms to ensure TrueSTEAM
operates properly.

No. of
Red
Light
Blinks

6 Water

7 HVAC power

TROUBLESHOOTING

Fault
Description

overow

sensed.

not present.

Steps to Fix
To be Performed by Professional
HVAC Technician Only

• Ensure drain hose is not kinked
or submerged in water at the
drain. Check functionality of
condensate pump if used.

• Check for water coming out of
drain/overflow line. If continuous
water flow is present, follow
the cleaning steps in the
Professional Installation Guide
(69-2036).

• After cleaning, set humidistat on
and monitor operation.

• If fault returns, unplug TrueSTEAM.

• Loosen cover screw and remove
cover.

• Disconnect water level sensor
wiring and lift snap-hinge
clamp to remove water sensor
assembly. See image on page 5.

• Clean probes using warm
soapy water so that the metal
is exposed. It is OK to use steel
wool or brush.

• Reassemble the sensor
assembly in the unit, reattach
and secure cover.

• Plug unit in, and press RESET
button.

• If fault reappears, replace water
sensor assembly and/or solenoid
valve.

• Turn humidistat off.

• At thermostat, validate that the
FAN setting turns the blower on.
If not, check the circuit breaker.
If circuit is tripped, reset or
replace fuse.

• If fault persists, unplug
TrueSTEAM and remove cover.

• Validate proper TrueSTEAM
wiring to R and C terminals, using
installation guide (69-2036).

• Ensure proper connection quality
of the wires.

• Inspect R and C wires at the
HVAC equipment board, ensuring
no breaks and good connection
if wire nuts are used.

• Hook AC volt meter across R and
C to validate 20-30VAC is present.
To measure, it may be necessary
to close furnace interlock switch.

• Secure TrueSTEAM cover and plug
unit in. Press the RESET button.

• If fault persists, recheck wiring or
replace unit.

Note: If using VisionPRO IAQ to

control TrueSTEAM, it is not
necessary to monitor HVAC
power. DIP 4 may be turned on
to disable monitor.

No. of
Red
Light
Blinks

8–11 The backup

12 Temperature

13 Tank failed

14 Heater failed

TROUBLESHOOTING

Fault
Description

weld monitor
input is
active when
the backup
heater relay
is off.

of the elec­tronic circuit
board is too
high.

to drain.

to boil water.

Steps to Fix
To be Performed by Professional
HVAC Technician Only

• Replace the TrueSTEAM unit.

• Ensure ventilation holes in the

• Ensure the TrueSTEAM is

• Turn humidistat off and allow

• Turn humidistat on and press

• Confirm humidity call starts

• Allow unit to run and check for

• If steam is present, replace

• Water in tank may be hot (>140ºF

• Press and hold the EMPTY

• If unit fails to drain, turn

• Once cool, follow tank cleaning

• Reassemble tank and press the

• If fault persists, replace the

• Press and hold EMPTY button

• Reassemble tank and press the

• Initiate humidistat call.

• If fault returns, replace the unit.

cover are clear of obstruction,
and that 1 foot of clearance is
maintained around the cover’s
ventilation holes.

installed in a location with
conditioned air 32°F (0°C) to
104°F (40°C).

time for electronic board to cool.
Unplugging unit and removing
cover will facilitate this.

RESET button.

(HUMIDIFYING light turns on).

steam leaks around tank and
ventilation holes.

TrueSTEAM.

[60ºC]) and can cause burns.

button for 3 seconds.

humidistat to OFF, or unplug the
humidifier and wait for water in
tank to cool. Ensure tank water
is cool before proceeding.

steps in the Professional
Installation Guide (69-2036EFS).

RESET button.

solenoid valve.

for 3 seconds, and follow
tank cleaning steps in the
Professional Installation Guide.

RESET button.

No. of

Fault

Red

Description
Light
Blinks

15 No Airow.

6 7 8 9

TROUBLESHOOTING

Steps to Fix
To be Performed by Professional
HVAC Technician Only

• Unplug TrueSTEAM and remove
cover

• Validate proper wiring to
terminals R and C, using the
diagrams in the installation guide
(69-2036).

• Ensure proper connection quality
of the wires.

• Inspect R and C wires at the
HVAC equipment board, ensuring
no breaks and good connection
if wire nuts are used.

• Hook AC volt meter across
airflow switch normally-open
(N.O.) terminal and R.

• Set thermostat FAN to off and
reduce system setpoint.

• Validate 0 VAC reading on AC
Volt Meter

• Set thermostat FAN to on.

• Once blower starts, validate 20­30VAC reading on AC volt meter.

• If voltage is not present, check
wiring and switch functionality.
Differential pressure switch may
require a new install location
(away from duct bends, etc), or it
may need to be replaced.

• If voltage is present, continue to
troubleshoot to validate proper
airflow monitoring.

• Keep AC volt meter across
airflow switch N.O. terminal and
R from HVAC unit.

• Turn humidistat off.

• Ensure DIP 4 and 5 are in off
(down) position.

• Secure TrueSTEAM cover and
plug in unit. Press the RESET
button.

• Set thermostat FAN to off and
reduce system set point.

• Set humidistat call and monitor
device. (may take 15-20 minutes)

• When sound of blower clears,
validate within 2 minutes that the
AC volt meter reads 20-30VAC.

• If time for switch to change state
takes longer than 2 minutes,
try a new install location for the
switch, where state change is
faster.

TrueSTEAM

HM512, HM509, and HM506

TROUBLESHOOTING AND

PARTS REPLACEMENT GUIDE

M28180A

SOLENOID VALVE REPLACEMENT

M28182

M28182

CAUTION: Ensure outside of tank is cool before
removing to prevent possible injury.

Ensure the TrueSTEAM is empty, and unplug.

1.
Shut off and disconnect the water line from the bottom

2.
of the unit.
Unlock the red lever and disengage the tank from the

3.
valve assembly and remove tank.
Remove TrueSTEAM from the mounting bracket.

4.

Remove the cover with a athead or Torx screwdriver.

5.
Disconnect the valve wire plug from the circuit board.

6.

Using a athead screwdriver, disengage the frame’s

7.
backplate at the four locations.
Slide the valve out of the back of the frame, and ease

8.
the wiring out of the TrueSTEAM frame.
Reassemble with the new solenoid valve, following

9.
steps 2–8 in reverse order.

IN-LINE WATER FILTER

Turn off water supply at the source (i.e. saddle valve)

1.

Push in on the lter’s compression snap-lock ttings

2.
where the 1/4-in. water line connects.
Pull out the water line as you are pushing in the snap-

3.
locks.

Install the new water lter, ensuring directional water

4.

ow is accurate per the lter label, by inserting the
water lines on either end of the lter.

Initiate a call for humidity by turning the humidistat on.

5.

Check the lter after 5 minutes of humidier operation

6.
to ensure no water leakage.

WATER TANK

Press and hold the EMPTY button for 3 seconds.

1.
Water will drain from the tank and the CLEAN TANK

2.
light will blink as it drains.
When the CLEAN TANK is on solid, the tank is empty.

3.
Turn the water valve arm to the UNLOCK position.

4.
Grip the solenoid toggle valve and slide it back to
disengage.
Hold bottom of the tank while pressing down the safety

5.
release button on the cover and slide the handle
forward.
The sediment screen is on the inside of the tank at the

6.
bottom. Push the release button away from the tank
wall to disengage the screen.
Pull out and clean or replace the screen.

7.
Clean tank and reattach.

8.

WATER SENSOR ASSEMBLY

Unplug the TrueSTEAM.

1.

Remove the cover with a athead or Torx screwdriver.

2.
Disconnect the water sensor wire from the electric

3.
circuit board.

Remove the Torx screw holding down the water sensor

4.
assembly.
Lift the metal hinge and remove the sensor assembly

5.

, .

Replace with the new sensor assembly and connect

6.
the new wires to the assembly and the circuit board.
Reattach the cover.

7.
Plug in the TrueSTEAM.

8.

A

REPLACEMENT PARTS

Part Part Number

10-foot Remote Hose and
Nozzle Kit
20-foot Remote Hose and
Nozzle Kit
Cover 50028004-001 2
Duct Nozzle 50028003-001 3
Remote Nozzles 50028001-001 4

Mounting Bracket 50020012-001 5
Solenoid Valve 50027997-001 6
In-Line Water Filter 50028044-001 7
HM512/HM509 Water Tank 50033181-001 8
HM506 Water Tank 50033182-001 9
Water Level Sensor
Assembly
Saddle Valve 32001616-001 11
Back-flow Water Valve 50030142-001 12

Differential Pressure Switch 50027910-001

50024917-001 1

50024917-002 1

50027998-001 10

B

Fig. Ref

13

REPLACEMENT PARTS

3

13

2

12

8

11

10

9

5

6

7

1

TROUBLESHOOTING

TrueSTEAM has internal diagnostics that monitor system
operation, maintenance schedules, and faults. If a system
fault is detected, the system will attempt to recover itself up to

ve times in a 24 hour period. If unable to recover in that time,

the red Call Service LED light will activate.

If the TrueSTEAM Call Service light is red, a system fault has

occurred from which the humidier can not recover by itself.

The table below shows the possible faults, along with steps to

x TrueSTEAM.

If the red Call Service LED light is on, press/release the
RESET button. The red Call Service LED light will begin
blinking in a series that indicates what fault occurred. Refer to

the table below for the fault signied by the number of blinks

that occur.

Press/hold the RESET button to clear the Service Timer light.

Press and hold the EMPTY button for 3 seconds to drain the
tank.

No. of
Red
Light
Blinks

4

1 Water/Heat-

2 Water

A

TROUBLESHOOTING

Fault
Description

er tempera­ture sensor
failed.

sensors
failed.

Steps to Fix
To be Performed by Professional
HVAC Technician Only

• Unplug TrueSTEAM and remove

• Check water sensor connection

• Reattach cover and plug

• If fault reappears, press and hold

• Reassemble tank and press the

• If fault returns, replace the unit.

• Unplug TrueSTEAM and remove

• Disconnect water level

• Clean sensor probes using warm

• Reassemble the sensor

• Plug unit back in and press the

• If fault reappears, replace sensor

B

cover.

to electronic board.

TrueSTEAM in.

the EMPTY button for 3 seconds
and follow tank cleaning steps
in the Professional Installation
Guide (69-2036).

RESET button.

cover.

sensor wiring, remove screw and
lift clamp.

Remove water sensor

assembly.

soapy water so that the metal
is exposed. It is OK to use steel
wool or brush.

assembly in the unit, reattach
and secure cover.

RESET button.

assembly.

Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.

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Honeywell International Inc.

1985 Douglas Drive North

Golden Valley, MN 55422

Honeywell Limited-Honeywell Limitée

35 Dynamic Drive

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69-2144—03 M.S. 06-08

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