Truma 4e combi water heater not working with gas. (4 Viewers)

[JamesT@Dundee]

On site with no EHU and have tried to heat water using gas. The unit is Truma 4E combi. Last time we'd used gas was about 2.5 years ago (at minus 5C - worked fine).

Have set energy source to Gas, and water heater to ECO and HOT (different attempts). Control panel shows shows flashing water symbol for about 20 seconds then the warning triangle - if I'm quick it shows error 45 (no mains duh!) then NOERR. and system resets source to MIX1 (gas and mains) and switches water heating off.

Gas is fine to the oven/hob, and tap on gas line to the heater is open.
It should operate the water heater in summer mode - though I have no idea if this is set manually or the system decides it's summer based on ambient temperature.

Has anyone had this happen? Any help much appreciated!

 

[PlacidoD]

I take it that heater was working recently on electricity? If not used for some time on either source of power maybe the dump valve is open? After that I am fresh out of suggestions.

 

[JamesT@Dundee]

I take it that heater was working recently on electricity? If not used for some time on either source of power maybe the dump valve is open? After that I am fresh out of suggestions.

 

[JamesT@Dundee]

Thanks. Yes, worked on mains. Also, boiler full, valve closed. Checked fuse as well (it's OK).

 

[David and Sally]

Just an idea. Can you hear it sparking to try to ignite?

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[TheMachMan]

I had this when we ran out of gas and switched bottles. There’s a tiny reset button on the boiler itself. Let me locate the advice I had before……….

 

[JamesT@Dundee]

Thanks.

 

[TheMachMan]

This assistance helped us when we ran out of gas and the boiler wouldn’t restart.
We had to reset the boiler itself:

Just to clarify how to reset the boiler, because the button must not be held in too long either! Here is a step guide:

1) The boiler is the big black round thing!

2) There is a green and a red light on it

3) The black button is just to the right from these lights

4) Press and hold the black button til a yellow light start flashing and THEN release the button while it is still flashing! If you wait to long no reset will occur!

5) Now only the green light is on and this means the boiler is resat and ready to use.

My note; the button is tiny, thin and not visible in the Malibu due to orientation of the boiler. It’s nestled under the wires near the LED’s.

 

[JamesT@Dundee]

Just an idea. Can you hear it sparking to try to ignite?

Just a faint click reported by partner.

 

[JamesT@Dundee]

This assistance helped us when we ran out of gas and the boiler wouldn’t restart.
We had to reset the boiler itself:

Just to clarify how to reset the boiler, because the button must not be held in too long either! Here is a step guide:

1) The boiler is the big black round thing!

2) There is a green and a red light on it

3) The black button is just to the right from these lights

4) Press and hold the black button til a yellow light start flashing and THEN release the button while it is still flashing! If you wait to long no reset will occur!

5) Now only the green light is on and this means the boiler is resat and ready to use.

My note; the button is tiny, thin and not visible in the Malibu due to orientation of the boiler. It’s nestled under the wires near the LED’s.

Thanks - will see if I can find it.

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[Gellyneck]

Just a faint click reported by partner.

I THINK the faint click is maybe the air circulation fan trying to start.
It can get blocked by dust, debris and dog hair
Can be cleaned by removing the fan cover and use a small paintbrush to clean it out.

 

[JamesT@Dundee]

I THINK the faint click is maybe the air circulation fan trying to start.
It can get blocked by dust, debris and dog hair
Can be cleaned by removing the fan cover and use a small paintbrush to clean it out.

Thanks. We did manage to get an ignition sound then immediately off again with the 'fleeting' W45H error before control panel showed Off again. Home in a couple of days so think we'll need to wait till then when we can test mains operation.

 

[JamesT@Dundee]

This assistance helped us when we ran out of gas and the boiler wouldn’t restart.
We had to reset the boiler itself:

Just to clarify how to reset the boiler, because the button must not be held in too long either! Here is a step guide:

1) The boiler is the big black round thing!

2) There is a green and a red light on it

3) The black button is just to the right from these lights

4) Press and hold the black button til a yellow light start flashing and THEN release the button while it is still flashing! If you wait to long no reset will occur!

5) Now only the green light is on and this means the boiler is resat and ready to use.

My note; the button is tiny, thin and not visible in the Malibu due to orientation of the boiler. It’s nestled under the wires near the LED’s.

Thanks for your steps. Removed cover and checked, awkward to get to but couldn't see any LEDs at all. I think I'll need to wait until we're back home to investigate further.

 

[Pausim]

Sometime the fault is the regulator. Faults show up first on the gas boiler which demands a lot more gas than the oven or hob. This means the boiler can lock out when other appliances are still performing properly.