Thetford RV fault codes

Thetford makes RV toilets and the absorption refrigerators fitted in most European caravans and motorhomes. Toilets signal status with coloured tank LEDs; the N3000 and N4000 fridges report numbered error codes — shown directly on an LCD panel, or as a binary pattern of cooling-level bars on an LED+ panel.

Refrigerator

Start here Thetford fridge blinking red: reading the error code A blinking red power LED with a flashing display is how a Thetford absorption fridge reports a fault. Whether you can simply read the number depends on which control panel your fridge was built with.

Error code 1
Flame detected when the gas should be off. The board sen… Error code 2
The burner control module returns incorrect feedback. Th… Error code 3
Gas lockout: the burner failed to light within 30 second… Error code 4
The 12 V heating element is off when it should be on. Th… Error code 5
The 12 V heating element is on when it should be off. Th… Error code 6
The 12 V supply is outside the permitted window. This is… Error code 7
No "engine run" signal (D+) while the control is in manu… Error code 8
The 230 V heating element is drawing at least 75 % less … Error code 9
The 230 V heating element is on when it should be off. T… Error code 10
The 230 V mains supply is out of range. Like code 6 on t… Error code 11
No energy source is available while the control is in AU… Error code 12
The display board and the power board have lost communic… Error code 13
The thermistor has failed and the control has switched i…

Toilet

Green tank LED
The tank-symbol LED glows solid green. The toilet system… No tank LED / off
The tank-symbol LED is not lit at all. The toilet system… Red tank LED (full)
The single tank-symbol LED on the wall switch glows soli… Yellow tank LED
The tank-symbol LED glows solid yellow/amber. This is an…