Thetford N175 User Manual

4 (1)

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

Yes

Check if the 5A fuse is OK

Yes

Check if the heater impedance is correct

(in Ohm)

Yes

Replace

Power board

SES version part 631219 or

EES version Part 631220

No

No

Type Min Max

N90-N97-

N98-N100-

312 380

N104-N109-

N112-N115

N145-N150-

218 266

N175-N180

AC Input issue

Change the fuse

(part 624030)

No

Replace the AC

heater

(see Spare Parts

List)

05/09

1/1

6.301

Thetford N175 User Manual

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

Yes

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

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

No

No

No

No

Type Min Max

N90-N97-

N98-N100-

0.93 1.13

N104-N109-

N112-N115

N145-N150-

0.88 1.08

N175-N180

1/1

DC input issue

Restore the connections

D+ input issue

Change the fuse

(part 626996)

No

Replace the DC

heater

(see Spare Parts

List)

6.302

1/1

05/09

05/09

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

Input supplied at the

No

AC input issue

fridge is stable and

 

 

included between

 

 

 

 

210V and 240V

 

 

Yes

Yes

Replace

Power board

SES version part 631219 or

EES version Part 631220

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

Input supplied at the

No

DC input issue

fridge is stable and

 

 

included between

 

 

 

 

9.5V and 15.5V

 

 

Yes

 

 

 

 

 

Check if the D+

No

D+ input issue

Yes

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

05/09

1/1

6.303/6.304

Error code 5: Senses flame when gas should be OFF

Check if the gas

No

Replace the gas

valve works

 

valve

 

 

 

Yes

 

 

 

 

 

Replace

 

 

Power board

 

 

SES version

 

 

part 631219

 

 

or

 

 

EES version

 

 

Part 631220

 

 

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

 

 

6.305/6.306/6.307

1/1

05/09

Error code 8: AC mains supply is below 20% nominal

Input supplied at the

No

AC input issue

fridge is stable and

 

 

included between

 

 

 

 

210V and 240V

 

 

Yes

 

 

 

 

 

Check if the 5A

No

Change the fuse

glass fuse is OK

 

(part 624030)

 

 

 

Yes

 

 

 

 

 

Replace

 

 

Power board

 

 

SES version

 

 

part 631219

 

 

or

 

 

EES version

 

 

Part 631220

 

 

05/09

1/1

6.308

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