Thetford N145 User Manual

Thetford Fridge terminology

Product lines

• DeLuxe line refrigerators with control knobs
All refrigerators which are supplied WITHOUT the LCD display control panel.

Manual Energy Control (MEC) Piëzo (V85) Manual Energy Control (MEC) Piëzo

Manual Energy Control (MEC) Electronic Manual Energy Control (MEC) Electronic

Isphording

• DeLuxe line refrigerators with LED

Smart Energy Selection (SES) LED

• Premium LCD line refrigerators
All refrigerators which are supplied WITH the LCD display control panel.

Either Electronic Energy Selection (EES) or Smart Energy Selection (SES) Automatic

Press the left button (mode selection switch), when you see Auto on the left
side of the display you have a SES version when not, you have an EES
version

Error code 1 AC heater current is measured to be 75% below nominal current

Input supplied at the

fridge is stable and

included between

210V and 240V

YesYes

Check if the 5A fuse

is OK

Yes

Check if the heater

impedance is correct

(in Ohm)

Yes

No

No

Type Min Max

N90-N97-

N98-N100-

N104-N109-

N112-N115

N145-N150-

N175-N180

312Ω 380Ω

218Ω 266Ω

AC Input issue

Change the fuse

(part 624030)

No

Replace the AC

heater

(see Spare Parts

List)

Replace

Power board

SES version

part 631219

or

EES version

Part 631220

Error code 2 DC heater current is measured to be 75% below nominal current

Input supplied at the

fridge is stable and

included between

9.5V and 15.5V
YesYes

Check if all the

connections are OK

Yes

Check if the D+

input is included

between 9.5V and

15.5V
Yes

Check if the 20A

fuse is OK

No

No

No

No

DC input issue

Restore the

connections

D+ input issue

Change the fuse

(part 626996)

Yes

Check if the heater

impedance is correct

(in Ohm)

Yes

Replace

Power board

SES version

part 631219

or

EES version

Part 631220

Type Min Max

N90-N97-

N98-N100-

N104-N109-

N112-N115

N145-N150-

N175-N180

0.93Ω 1.13Ω

0.88Ω 1.08Ω

No

Replace the DC

heater

(see Spare Parts

List)

Error code 3 AC heater is ON when it should be OFF

Input supplied at the

fridge is stable and

included between

210V and 240V

YesYes

Replace

Power board

SES version

part 631219

or

EES version

Part 631220

Input supplied at the

fridge is stable and

included between

9.5V and 15.5V

No

AC input issue

Error code 4 DC heater is ON when it should be OFF

No

DC input issue

YesYes

Check if the D+

input is included

between 9.5V and

15.5V and if polarity
is correct

Yes

Replace

Power board

SES version

part 631219

or

EES version

Part 631220

No

D+ input issue

Error code 5 Senses flame when gas should be OFF

Check if the gas

valve works

YesYes

Replace

Power board

SES version

part 631219

or

EES version

Part 631220

Replace Power board: - SES version part 631219

No

Replace the gas

valve

Error code 6 Senses gas output terminal ON when should be OFF

- EES version part 631220

Error code 7
Senses gas output terminal OFF
when should be ON

Replace Power board: - SES version part 631219

- EES version part 631220

Error code 8 AC mains supply is below 20% nominal

Input supplied at the

fridge is stable and

included between

210V and 240V

Yes

Check if the 5A

glass fuse is OK

YesYes

Replace

Power board

SES version

part 631219

or

EES version

Part 631220

No

No

AC input issue

Change the fuse

(part 624030)

Error code 9 Gas lockout because flame fails to ignite after 30 seconds

Check if there is

gas to the fridge

Yes

Check if the gas

lights

Yes

Check if the spark

continues

Yes

Check if the

electrode gap is set

at about 4 mm

above the burner

No

No

Check if there

is a spark

No

No

No

Yes

No

Ensure there is gas

in the cylinder & that

it is turned on along

with all isolation tops

Adjust the electrode

gap to approx. 4 mm

Yes

Check electrode

connections & look

for damages

Yes

Injector of the burner

is clean. Flame is

dense and blue.

Yes

Check if the gas

pressure is between

28 and 30 mb

No

Check the gas

installation

Yes

No

No

Yes

Check if the

gas valves

opens

Yes

Replace

Power board

SES version

part 631219

or

EES version

Part 631220

No

No

No

Replace electrode

Replace the gas

valve

Clean the burner and

the injector. Replace
the burner in case of

bad combustion

(see Spare Parts

List)

Error code 10
“No engine running” signal is
Present and control is in Manual DC
mode

To know if D+ polarity is good, select manually DC
mode engine off.
If no error code occurs, that means the D+ input is
versed.
Ensure power supply is capable to supply correct
amperage.

Input supplied at the

fridge is stable and

included between

9.5V and 15.5V
YesYes

Check if the D+

input is included

between 9.5V and

15.5V and if polarity
is correct

Yes

Check if the 20A

fuse is OK

YesYes

Replace

Power board

No

No

No

DC input issue

D+ input issue

Change the fuse

(part 626998)

SES version

part 631219

or

EES version

Part 631220

Error code 11 No energy source is available and control is on AUTO mode

Please make sure that all energy sources are available
during the trial

Select all the

energies manually

and check which

error codes occur

Yes

See the description

of the other error

codes

No

Replace

Power board

SES version

part 631219

Error code 12
Supply voltage DC is out of range
(9.5V – 15.5V)

If DC mode have been selected manually, the
refrigerator is not switching automatically on another
source of energy when the engine is off

Input supplied at the

fridge is stable and

included between

9.5V and 15.5V

Yes

If RV is equipped

with a solar panel.

Disconnect it and

check if the

refrigerator is OK

Yes

Issue with the solar

panel regulator or

solar panel input can

be 100% excluded

No

No

No

DC input issue

D+ input issue

Solar panel issue

YesYes

Check if the 5A fuse

is OK

Yes

Contact Thetford

No

Change the fuse

(part 624030)

Error code 13 Thermistor fails, control automatically switches to backup mode (BOS)

Check if thermistor

is present

Yes

Check if the

thermistor is

plugged in correctly

Yes

Check if the wiring

loom is connected to

the power board

correctly

Yes

Check if the pins in

the wiring loom plug

present and not bent

or loose

Yes

Replace

Power board

SES version

part 631219

or

EES version

Part 631220

No

No

No

No

No

Broken wiring

harness inside the

fridge issue

Replace the

complete fridge see

the replacement
fridges overview

For the partnumber
of a warranty fridge

When a N180 is

concerned please

replace the fridge

door only

Door number

629724-07

Insert thermistor

(part 623077)

Plug in correctly

(5th fin from the right)

Connect correctly

Fix pins if possible

Error code 14 Display board and power board lost communication to each other

Input supplied at the

fridge is stable and

included between

9.5V and 15.5V
YesYes

Check if the 2A

glass fuse is OK

YesYes

Check if the
connections

between the boards

are OK

Yes

Replace

Power board

SES version

part 631219

or

EES version

Part 631220

Yes

No

No

No

No

DC input issue

Change the fuse

(part 626998)

Restore the

connections when

not OK replace the

display board

Broken wiring

harness inside the

fridge issue

Replace the

complete fridge see

the replacement
fridges overview

For the partnumber

of a warranty fridge

Contact Thetford

When a N180 is
concerned please
replace the fridge

door only

Door number

629724-07

Lack of performance
No error code

¾ On 12 Volts

Do the testing of the fridges on the manual mode

Check if the input at

the DC HC poles of

the Power Board is

> 13.5V

Yes

Check if the input at

the heater

connection to the

Power Board is

> 13V

Yes

Check if the heater

impedance is correct

(in Ohm)

Yes

No

No

Type Min Max

N90-N97-

N98-N100-

N104-N109-

N112-N115

N145-N150-

N175-N180

0.93Ω 1.13Ω

0.88Ω 1.08Ω

DC input issue

Replace

Power board

SES version

part 631219

or

EES version

Part 631220

No

Replace the DC

heater

(see Spare Parts

List)

Check if the DC

heater is properly

settled

Yes

Contact Thetford

No

Install the DC heater

properly

¾ On 230 Volts

Do the testing of the fridges on the manual mode

Check if the input

between the (+) and

the (-) at the power

board is over 230

Volts

Yes

Check if the input at

the heater

connection to the

Power Board is

> 215V

Yes

Check if the heater

impedance is correct

(in Ohm)

Yes

No

No

Type Min Max

N90-N97-

N98-N100-

N104-N109-

N112-N115

N145-N150-

N175-N180

312Ω 380Ω

218Ω 266Ω

AC input issue

Replace

Power board

SES version

part 631219

or

EES version

Part 631220

No

Replace the AC

heater

(see Spare Parts

List)

Check if the AC

heater is properly

settled

Yes

Contact Thetford

No

Install the AC heater

properly

¾ On Gas

Do the testing of the fridges on the manual mode

Injector of the burner

is clean. Flame is

dense and blue. Gas

pressure is between

28 and 30 mb

Yes

Check if the

thermistor is

properly fitted on the

5th fin from the right

Yes

Check if the flame

diffuser is in the pipe

YesYes

Check if the burner

is set properly in

front of the pipe

No

No

No

No

Clean the burner.

Replace the burner in

case of bad
combustion

(see Spare Parts

List)

Install the thermistor

at the right place

Install a flame

diffuser

(part nr to be made)

Replace the

refrigerator

Power board
on all LCD fridges

Issue : A not replaceable fuse (F5) is blowing on the power

boards, caused by wrong signal in circuit (f.i. short cut).

Solution : Re-settable fuse integrated on the power board.

Implementation : November 1st 2007

Spare part nr. : 631219 and 631220

Compensation : 30 minutes

Repair-instruction : See repair instruction part

Power board old version
Underside of Top Half F5 fuse is at top centre

Modified power board with re-settable fuse shown in position

Corrosion on all
Fridges shelves

Issue : Corrosion on all shelves

Solution : Re-inforced coating process to prevent rusting during

life time product (7 years)

Implementation : June 22nd 2007 for all shelves

Spare part nr. : See spare part list

Compensation : 5 minutes

Repair-instruction : not included

Gas connections

Picture Tool Torque

Torque spanner 13mm 3 +1/-0 Nm

Nut solenoid GV

Burner – orifice adapter

Gas tube assy – orifice adapter

Torque spanner 16mm 7.5 +1/-0 Nm

Torque spanner 14mm 15 +1.5/-0 Nm

Torque spanner 11mm 10 +0.5/-0 Nm

Gas tube assy – V85 GV

Gas inlet tube – V85 GV

Torque spanner 19mm 12 +2/-0 Nm

Torque spanner 8mm 1.5 +0.5/-0 Nm

Thermocouple – V85 Gasvalve

Torque spanner 17mm 20 +2/ -0

Gas inlet tube - LCD