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Hot water but no CH after I turned my boiler back on from summer mode
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DanielDeronda
Posts: 216 Forumite

With no need to have my heating on over the summer, I put my Vaillant Ecotech Pro 24 combi boiler in summer mode, so just had hot water & no central heating.
With the temperatures getting lower I decided to switch the central heating back on.
But when I did, the heating didn't seem to switch back on so when I switched a radiator on it remained cold.
I depressurised the boiler & the bar is now 1.6 & I'm getting no error codes.
I've reset the boiler a few times but no luck. I've changed the boiler & thermostat settings
Is there anything I can do myself before getting a gas safe engineer in?
I had this issue in previous years but can't remember how it got resolved
With the temperatures getting lower I decided to switch the central heating back on.
But when I did, the heating didn't seem to switch back on so when I switched a radiator on it remained cold.
I depressurised the boiler & the bar is now 1.6 & I'm getting no error codes.
I've reset the boiler a few times but no luck. I've changed the boiler & thermostat settings
Is there anything I can do myself before getting a gas safe engineer in?
I had this issue in previous years but can't remember how it got resolved
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Comments
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I guess summer mode only turn on the pump to stop it sticking and not the diverter valve?
Good idea to to run the heating for 5 min monthly.0 -
Give the motorised valves a tap with a hammer.No reliance should be placed on the above! Absolutely none, do you hear?0
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DanielDeronda said:With no need to have my heating on over the summer, I put my Vaillant Ecotech Pro 24 combi boiler in summer mode.
I depressurised the boiler & the bar is now 1.6 & I'm getting no error codes.
I've reset the boiler a few times but no luck. I've changed the boiler & thermostat settings.
Good info - you have a combi boiler, so everything is usually contained within the casing, so out of reach to the user.
So, things to mainly try will involve checking that the controls are working, and that the radiator valves are not stuck.
1) What heating controls do you have? Photo of the room stat, please? And, how do you 'time' the heating to go on and off - is the 'programmer' on the boiler, or separate? Just tell - and ideally photograph - everything, please!
2) When you tell the CH to come on, does the boiler respond in any way at all? Anything? Or does it remain 'deed'.
3) What type of radiator valves do you have? Do they have large heads with numbers up to '5'?
And, importantly, what type of valves are on the rad(s) in the room with the wall 'stat?
4) You released boiler pressure down to 1.6bar? What was it at before? And does it now remain steady at 1.6?
(1.6 is still a tad too high, tho' 'ok', but we won't worry about that for the time being.)0 -
Here are some photos of the boiler: pic 1 is the thermostat Pic 2 is a radiator valve, pic 3are the heating controls for the hot water & CH but timer doesn't work pic 4 is an isolator valve I think1
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The boiler dors try & come on when I reset the boiler but then switches off.
Sorry misquoted on the bar pressure it was less than 1 bar - I repressurised the boiler to 1.5 bar & has stayed at that level
Let me know if you need any more details.1 -
The bits you need to get at are the valves inside the boiler cover. If you don't want to take that off, then get a boiler engineer in.No reliance should be placed on the above! Absolutely none, do you hear?0
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