Thetford N175 User Manual

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

N90-N97-

N98-N100-

N104-N109-

N112-N115

N145-N150-

N175-N180

No

No

AC Input issue

Change the fuse

(part 624030)

MaxMinType

380¡¡¡¡312¡¡¡¡

266¡¡¡¡218¡¡¡¡

No

Replace the AC

heater

(see Spare Parts

List)

05/09

Replace

Power board

SES version

part 631219

or

EES version

Part 631220

6.3011/1

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

Input supplied at the

fridge is stable and

included between

10.5V and 15.4V

YesYes

Check if all the

connections are OK

Yes

Check if the D+

input is included

between 10.5V and

15.4V

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

6.302 1/1 05/09

N90-N97-

N98-N100-

N104-N109-

N112-N115

N145-N150-

N175-N180

1/16.302

MaxMinType

1.13¡¡¡¡0.93¡¡¡¡

1.08¡¡¡¡0.88¡¡¡¡

No

Replace the DC

heater

(see Spare Parts

List)

05/09

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

Yes

Yes

Replace

Power board

SES version

part 631219

or

EES version

Part 631220

No

AC input issue

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

Input supplied at the

fridge is stable and

included between

9.5V and 15.5V

No

DC input issue

Yes

Check if the D+

input is included

between 9.5V and

15.5V and if polarity

Yes

is correct

Yes

Replace

Power board

SES version

part 631219

or

EES version

Part 631220

No

D+ input issue

05/09

6.303/6.3041/1

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

No

Replace the gas

valve

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

Replace Power board: - SES version part 631219

- 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

1/16.305/6.306/6.307

05/09

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)

05/09

1/1 6.308

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

No

Check if there

is a spark

No

No

Yes

No

Ensure there is gas

in the cylinder & that

it is turned on along

with all isolation taps

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)

1/16.309

05/09

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)

05/09

SES version

part 631219

or

EES version

Part 631220

1/1 6.310

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

1/16.311

05/09

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

05/09

YesYes

Check if the 5A fuse

is OK

Yes

Contact Thetford

No

1/1 6.312

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

No

No

No

No

Insert thermistor

(part 623077)

Plug in correctly

(5th fin from the right)

Connect correctly

Fix pins if possible

Yes

Replace

Power board

SES version

part 631219

or

EES version

Part 631220

No

Check with outside wire

harness before replacing

the complete fridge

1/16.313

Broken wiring

harness inside the

fridge issue.
Replace the

complete fridge, see

the replacement
fridges overview

For the partnumber

of a warranty fridge

05/09

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

No

No

No

No

Check with outside wire

harness before replacing

the complete fridge

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

05/09

Yes

Contact Thetford

Broken wiring inside fridge

(or door if an N180).

Replace complete fridge. If

an N180 check

connections on underside

of fridge and in bottom of

door. Try a new door

before replacing complete

fridge.

1/1 6.314

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

1/16.317

05/09

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

N90-N97-

N98-N100-

N104-N109-

N112-N115

N145-N150-

N175-N180

No

No

DC input issue

Replace

Power board

SES version

part 631219

or

EES version

Part 631220

MaxMinType

1.13¡¡¡¡0.93¡¡¡¡

1.08¡¡¡¡0.88¡¡¡¡

No

Replace the DC

heater

(see Spare Parts

List)

Check if the DC

heater is properly

settled

Yes

Contact Thetford

No

1/36.315

Install the DC heater

properly

05/09

¾ On 230 Volts

Do the testing of the fridges on the manual mode

Check if the input

between the (L) and

the (N) at the power

board is over 220

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

N90-N97-

N98-N100-

N104-N109-

N112-N115

N145-N150-

N175-N180

No

No

AC input issue

Replace

Power board

SES version

part 631219

or

EES version

Part 631220

MaxMinType

380¡¡¡¡312¡¡¡¡

266¡¡¡¡218¡¡¡¡

No

Replace the AC

heater

(see Spare Parts

List)

05/09

Check if the AC

heater is properly

settled

Yes

Contact Thetford

No

2/3 6.315

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

3/36.315

05/09

Power board on all LCD fridges

Issue : A non 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

05/09

Modified power board with re-settable fuse shown in position

1/1 6.316