Vaillant Eco TEC plus 937

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

Asked by Mariana on 6th Dec 2021
Expert Trade Answers
"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"
Answered on 6th Dec 2021 - Member since Jul 2020 - report
"You will need to call a gas engineer out to fix the problem"
Answered on 6th Dec 2021 - Member since Oct 2021 - report
"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"
Answered on 6th Dec 2021 - Member since Jul 2017 - report
"It might be a pump problem or heat exchanger
Only a gas engineer can sort this problem
Thanks"
Answered on 6th Dec 2021 - Member since Nov 2021 - report
"It may be an issue with the pump or a sensor. Advised to get a Gas Safe engineer to diagnose further."
Answered on 6th Dec 2021 - Member since Nov 2021 - report
"Sorry to say you need a registered gas engineer to look at your boiler. There is no self help when it comes to gas."
Answered on 6th Dec 2021 - Member since Oct 2020 - report
"Try and reset the boiler what controls do UPI give for central heating?"
Answered on 6th Dec 2021 - Member since Jun 2020 - report
"Hi

Possible fault with hot water pump on the boiler. This may well need replacing.

Hope this helps

Regards"
Answered on 31st Jan 2022 - Member since Jan 2022 - report
"I think the plate heat exchanger in my opinion but then again could be the pump. Need a gas engineer to look at it"
Answered on 6th Dec 2021 - Member since Nov 2021 - report
"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?"
Answered on 6th Dec 2021 - Member since Nov 2021 - report
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