Thetford Refrigerator: “Error code 1”
danger RV refrigerator error codes
What it means
Flame detected when the gas should be off. The board senses a flame although it has closed the gas valve, so it reports an unsafe state rather than a cooling fault. How you read this code depends on the control panel. An LCD panel shows a spanner symbol with the number next to it. An LED+ panel shows nothing until you ask for it: while the display is blinking, hold all three buttons at once until it stops, and the cooling-level bars that then light up are a binary number — the five bars are worth 16, 8, 4, 2 and 1 from left to right, added together. And note Thetford's own warning: with no 12 V DC at the control board, no error code is shown at all.
Most likely causes
- Known fault in early boards that Thetford addresses with a dedicated modification kit most likely
- Gas valve not closing properly common
- Flame-sensing circuit misreading less common
Safe checks you can do yourself
- Switch the fridge off and on again, then disconnect the 12 V supply briefly and reconnect it — Thetford has both steps as the first branch of its own flow.
- Note the build date and serial number before ordering anything: the fix differs before and after 22-06-2015 (serial E173S…).
- Have the gas valve checked for correct closing if the code survives the reset.
How to reset / clear Error code 1
- Turn the refrigerator off and on.
- If it persists, disconnect the 12 V DC supply, wait a moment, and reconnect it.
When to call a technician
The code returns after both resets. Thetford treats this as a hardware fix — an error-code-1 modification kit (690449 for the Tab connector, 690799 for Mate-N-lok), and depending on build date either an LED/LCD service kit (691138 / 691139) or a new power board (692247).
Accuracy notes
The number alone is not enough — Thetford uses different numbering per product family. This table is the N3000 and N4000 absorption series (codes 1-13). The older Premium LCD line (N90-N180, built 2005-2012) has its own, different 1-14 table in which the same numbers mean other things, and the T2000 compressor fridges use a third scheme again. Model numbers are no help either: N90, N97, N100, N104, N109, N112 and N145 appear in both the Deluxe line and the Premium LCD line, so a bare model number cannot decide which table applies. Check which family your fridge belongs to before acting on a number.
Applies to
N3080 · N3090 · N3097 · N3100 · N3104 · N3108 · N3112 · N3115 · N3145 · N3150 · N3170 · N3175 · N4080 · N4090 · N4097 · N4100 · N4104 · N4108 · N4112 · N4141 · N4142 · N4145 · N4150 · N4170 · N4175
FAQ
What does Thetford Refrigerator code "Error code 1" mean?
Flame detected when the gas should be off. The board senses a flame although it has closed the gas valve, so it reports an unsafe state rather than a cooling fault. How you read this code depends on the control panel. An LCD panel shows a spanner symbol with the number next to it. An LED+ panel shows nothing until you ask for it: while the display is blinking, hold all three buttons at once until it stops, and the cooling-level bars that then light up are a binary number — the five bars are worth 16, 8, 4, 2 and 1 from left to right, added together. And note Thetford's own warning: with no 12 V DC at the control board, no error code is shown at all.
How do I reset Thetford Refrigerator Error code 1?
Turn the refrigerator off and on. If it persists, disconnect the 12 V DC supply, wait a moment, and reconnect it.
What is the most common cause of Error code 1 on a Thetford Refrigerator?
The most likely cause is known fault in early boards that thetford addresses with a dedicated modification kit.
Related · Thetford refrigerator
The burner control module returns incorrect feedback. The ignition… Error code 3
Gas lockout: the burner failed to light within 30 seconds, so the board… Error code 4
The 12 V heating element is off when it should be on. The board is… Error code 5
The 12 V heating element is on when it should be off. The board sees DC… Error code 6
The 12 V supply is outside the permitted window. This is a supply fault,…
Sources
- Troubleshooting — Absorption Refrigerator N3000 series — Error-code table 1-13, "Service mode LED" and "Service mode LCD" pages, per-code diagnostic flows (Thetford)
- Troubleshooting — Absorption Refrigerator N4000 — Version 05-2019 — identical error-code table 1-13 (Thetford)
- Fehlerbehebung — Absorber-Kühlschrank N3000 (deutsche Ausgabe) — Fehlercode-Tabelle 1-13, "Service Modus LED" mit Binärgewichten 16/8/4/2/1 (Thetford)
● Checked against 3 manufacturer documents · Last verified 2026-08-04 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual. How we verify