Vaillant Eco TEC plus 937

Question

I don't have a hot water but I have a central heating. The display shows F81 & F91. What I can do?

Jason · Accepted Answer

You either have a problem with the hot water pump or the plate heat exchanger is blocked either way you will require a gas safe engineer to look at this problem

Aasim · Answer

You will need to call a gas engineer out to fix the problem

Stephen · Answer

Hi, my name is Steve from SJS Plumbing and heating. The fault is specific to that model of Vaillant that has a hot water storage tank.The fault could be a blocked plate heat exchanger or the secondary hot water pump.
Unfortunately, you will need a heating engineer to fix it.
Many thanks Steve

Manmeet · Answer

It might be a pump problem or heat exchanger 
Only a gas engineer can sort this problem 
Thanks

Hasan · Answer

It may be an issue with the pump or a sensor. Advised to get a Gas Safe engineer to diagnose further.

Paul · Answer

Sorry to say you need a registered gas engineer to look at your boiler. There is no self help when it comes to gas.

Ryan · Answer

Try and reset the boiler what controls do UPI give for central heating?

Mohammed · Answer

Hi 

Possible fault with hot water pump on the boiler. This may well need replacing.

Hope this helps

Regards

Naeem · Answer

I think the plate heat exchanger in my opinion but then again could be the pump. Need a gas engineer to look at it

Majid · Answer

Your system is not circulating the heat out of the combustion chamber, could be a number of reasons. Have you needed to top up the system recently?

Vaillant Eco TEC plus 937

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