been called by a friend, he has a vaillant turbomax 242e, he said the boiler only works 5 seconds and then have a rest of about 5 seconds, so there is no hot water, i got there and checked:
1. air switch is fine,
2. rectification lead is ok,
3. pump is running
4, i noticed that when the boiler runs for 5 second the water temp goes to 90 degree very quickly and then the flame is gone,
5, thecked the secondary heat exchanger, it is very cold, looks no hot water goes through,
i am thinking the divert valve is wrong, shall i change it?
cheers in advance
1. air switch is fine,
2. rectification lead is ok,
3. pump is running
4, i noticed that when the boiler runs for 5 second the water temp goes to 90 degree very quickly and then the flame is gone,
5, thecked the secondary heat exchanger, it is very cold, looks no hot water goes through,
i am thinking the divert valve is wrong, shall i change it?
cheers in advance