Truma water heater red light

[Omalley]

I’ve had issues with my truma water heater and a red light on the controller. I replaced mostly everything then ended up just buying a new heater but the same issue keeps happening. Saw someone say the gas regulator so I’ve just replaced that as well and still have the red light. I’m running out of ideas. Has anyone got any advice

 

[Diabalo]

I’ve had issues with my truma water heater and a red light on the controller. I replaced mostly everything then ended up just buying a new heater but the same issue keeps happening. Saw someone say the gas regulator so I’ve just replaced that as well and still have the red light. I’m running out of ideas. Has anyone got any advice

My red light often stays on needs a few tries before it goes iut

 

[Omalley]

I’ve given it quite a few tries now but will do it again. Just seems odd it’s the exact same fault even with a new heater.

 

[RandallC]

Check the comms cable connectors ( recall as RJ11) but not how many pins. Had similar issue in past found comms cable connector at truma heater iffy, cut it of and replaced it. All OK.

Edit comms cable runs between heater and heater controls (NOT Inet) but note inet system similar comms set up

 

[GeoffnDee]

Have you checked the gas supply pipe and its isolation tap for possible obstructions and what is the model number of the Truma water heater you have a problem with ?

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[Lenny HB]

Constant red like possibly low volts, often due to under size wiring.
Try running a couple of decent size wires in parallel with exsisting cables.

 

[Vikdikdok]

I just today had the exact same red light problem & after scratching my head I gave in & re-read the (F) manual . . .
I'd forgotten to remove the winter cover on the exhaust outlet
- Problem solved it fired up straight away

 

[Bessy765]

Just for info, red light flashing low volts fixed red light gas fault.

 

[Omalley]

Check the comms cable connectors ( recall as RJ11) but not how many pins. Had similar issue in past found comms cable connector at truma heater iffy, cut it of and replaced it. All OK.

Edit comms cable runs between heater and heater controls (NOT Inet) but note inet system similar comms set up

Glad you said this. That’s the only cable I left in place from the old heater. I’ll try this today

 

[Omalley]

Have you checked the gas supply pipe and its isolation tap for possible obstructions and what is the model number of the Truma water heater you have a problem with ?

I’ve got under the caravan and checked for kinks and also had the isolation valve off. Seems free flowing

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[Omalley]

Just for info, red light flashing low volts fixed red light gas fault.

Mines solid red

 

[Omalley]

Constant red like possibly low volts, often due to under size wiring.
Try running a couple of decent size wires in parallel with exsisting cables.

I’ve not heard this before. It does work fine on electric and only gas is the issue. I’m going to change the comms cable today.

 

[Lenny HB]

I’ve not heard this before. It does work fine on electric and only gas is the issue. I’m going to change the comms cable today.

When on EHU the charger will be on so the voltage will be higher.

 

[GeoffnDee]

Mines solid red

As well as a possible gas supply problem a fault on the air intake/exhaust side will bring also this fault signal up (if it is a C3402 or C6002 and probably other models)

 

[The Old Man]

Have you checked the gas supply pipe and its isolation tap for possible obstructions and what is the model number of the Truma water heater you have a problem with ?

Mine comes on when the gas bottle is empty.