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