Hi,
I was hoping someone on the forum could help me regarding problems with a Vaillant 835. Here's how I have got to a boiler with no hot water/heating.
I noticed that the hot water was going cold in the shower and that the boiler kept losing pressure (had to be topped up every day) about 2 months ago. My insurance company sent someone round who re-pressurized the vessel. This seemed to fix the pressure problem for a while, but not the hot water problem.
To fix the hot water problem, the company came back and replaced the "NTC". This didn't solve the hot water problem and the pressure problem resurfaced.
They have been around again and have now replaced the PCB, which has solved nothing.
This has been rumbling on for about 2 months now and the boiler has got must worse during this time. The last time I spoke to the engineer he said "maybe a powerflush is needed, maybe a new boiler". To be honest, I've lost all faith in the company as I'm without hot water or heating during a pretty chilly time!
I tried to re-fill the boiler last night and (with no hot water demand and heating switched off) the pressure guage fell to zero again within 30mins. I filled it up again this morning (6am), switched the heating on, but the pressure dropped again at around 11am. I'm not sure the heating was actually doing anything as the radiators were lukewarm and d40 was at 70c, d41 was at 41c.
The boiler is seven years old and has been serviced every year. There's no magnaclean device fitted and from what I've read around the forums/other sites the plate h'ex sounds like its blocked. I'm not sure this would cause all the problems I've mentioned above.
Thanks for reading the post and for any advise!
I was hoping someone on the forum could help me regarding problems with a Vaillant 835. Here's how I have got to a boiler with no hot water/heating.
I noticed that the hot water was going cold in the shower and that the boiler kept losing pressure (had to be topped up every day) about 2 months ago. My insurance company sent someone round who re-pressurized the vessel. This seemed to fix the pressure problem for a while, but not the hot water problem.
To fix the hot water problem, the company came back and replaced the "NTC". This didn't solve the hot water problem and the pressure problem resurfaced.
They have been around again and have now replaced the PCB, which has solved nothing.
This has been rumbling on for about 2 months now and the boiler has got must worse during this time. The last time I spoke to the engineer he said "maybe a powerflush is needed, maybe a new boiler". To be honest, I've lost all faith in the company as I'm without hot water or heating during a pretty chilly time!
I tried to re-fill the boiler last night and (with no hot water demand and heating switched off) the pressure guage fell to zero again within 30mins. I filled it up again this morning (6am), switched the heating on, but the pressure dropped again at around 11am. I'm not sure the heating was actually doing anything as the radiators were lukewarm and d40 was at 70c, d41 was at 41c.
The boiler is seven years old and has been serviced every year. There's no magnaclean device fitted and from what I've read around the forums/other sites the plate h'ex sounds like its blocked. I'm not sure this would cause all the problems I've mentioned above.
Thanks for reading the post and for any advise!