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Hi all, I've found lots of good advice here regarding Vailliant boilers so signed up to see if anyone could offer me any advice on my current problem.
I've got a Vaillant Turbomax combi boiler (not sure of exact model). I recently drained down the whole system to fix a leaking joint in the central heating. This is now fixed, and I refilled the system using the integrated filling loop, putting up to about 1.2 bars. I then bled all the radiators in the house and topped it back up to 1.2.
The central heating now flows and works fine. Radiators get hot very quickly.
The hot water however is being tricky. It does work temporarily but then starts to get cold, while the boiler continues to burn away, with the display temp getting hotter and hotter. When I ran the hot water yesterday I saw it get to 100C before quickly turning off the tap. The flame stopped, but the temperature continued to rise up to 115C before dropping. It then takes a long time to go down - 10 mins or so.
When I looked at the boiler this morning it had a F20 error code (restarting it cleared that).
I've known it to do this temporarily before after topping up the system, but previously I've heard it make a massive glugging noise like water is replacing air throughout the boiler, and then it has started working again. This time (the first time I've done a full drain and refill) it's not made the glugging noise and I wonder if perhaps there's air in the system - I wondered if perhaps the temperature sensor is in air instead of water which could be why it's not matching the hot water temperature and then taking so long to cool? (Just a guess!)
Any advice you can give would be very much appreciated.
Many thanks,
James
I've got a Vaillant Turbomax combi boiler (not sure of exact model). I recently drained down the whole system to fix a leaking joint in the central heating. This is now fixed, and I refilled the system using the integrated filling loop, putting up to about 1.2 bars. I then bled all the radiators in the house and topped it back up to 1.2.
The central heating now flows and works fine. Radiators get hot very quickly.
The hot water however is being tricky. It does work temporarily but then starts to get cold, while the boiler continues to burn away, with the display temp getting hotter and hotter. When I ran the hot water yesterday I saw it get to 100C before quickly turning off the tap. The flame stopped, but the temperature continued to rise up to 115C before dropping. It then takes a long time to go down - 10 mins or so.
When I looked at the boiler this morning it had a F20 error code (restarting it cleared that).
I've known it to do this temporarily before after topping up the system, but previously I've heard it make a massive glugging noise like water is replacing air throughout the boiler, and then it has started working again. This time (the first time I've done a full drain and refill) it's not made the glugging noise and I wonder if perhaps there's air in the system - I wondered if perhaps the temperature sensor is in air instead of water which could be why it's not matching the hot water temperature and then taking so long to cool? (Just a guess!)
Any advice you can give would be very much appreciated.
Many thanks,
James