We have had an intermitent problem with our 15 year old Vaillant boiler for several months. Some days we cannot get domestic hot water out of the system. You can hear the pumps or something fire up in the boiler and a clicking sound but it does not fire. Other days it will be fine. We have had British Gas out on several occasions, but whenever they turn up the problem is not their.
We called them out a couple of weeks ago for the same problem, and luckily this time the problem was evident when the engineer turned up and he diagnosed that the diverter valve had got scale on it and was not functioning correctly. The next day he returned and replaced the valve and for the rest of the day the hot water was fine.
The next couple of days, hot water was intermittent again. I took a look at the boiler and saw a small micro switch next to the arm that comes off the top of the diverter valve. With the domestic hot water switched on and the boiler clicking but not firing,it you manually press this switch with your finger the boiler fires.
This micro switch has a small amount of adjustment on it, so I adjusted it slightly closer to the diverter valve arm and for about 2 weeks the boiler worked flawlessly.
Now it has started playing up again. Could it be the microswitch if faulty or could the fault lie elsewhere ?
The boiler is a Vaillant VCW 242E. Could anyone suggest anything, and if it is the microswitch, it looks relatively easy to replace, where would I go to source on.
Many many thanks for any replies.
Regards
Richard Walters
We called them out a couple of weeks ago for the same problem, and luckily this time the problem was evident when the engineer turned up and he diagnosed that the diverter valve had got scale on it and was not functioning correctly. The next day he returned and replaced the valve and for the rest of the day the hot water was fine.
The next couple of days, hot water was intermittent again. I took a look at the boiler and saw a small micro switch next to the arm that comes off the top of the diverter valve. With the domestic hot water switched on and the boiler clicking but not firing,it you manually press this switch with your finger the boiler fires.
This micro switch has a small amount of adjustment on it, so I adjusted it slightly closer to the diverter valve arm and for about 2 weeks the boiler worked flawlessly.
Now it has started playing up again. Could it be the microswitch if faulty or could the fault lie elsewhere ?
The boiler is a Vaillant VCW 242E. Could anyone suggest anything, and if it is the microswitch, it looks relatively easy to replace, where would I go to source on.
Many many thanks for any replies.
Regards
Richard Walters