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- 7 Sep 2010
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Hi
I have just moved into a house with an Vaillant 824/2 E boiler. Heating seems to work fine DHW was only getting luke warm. I noticed the CH flow pipe was getting hot when DHW was operated so changed to Diverter Valve. this seem to have solved the CH flow pipe problem and now DHW get super hot -
The problem is - is it now getting too hot??. The DHW temp dial seems to make no difference at all to the actual tap temp. When tap is switched on the boiler display heats up and up and up until it reaches 85 degress on the display then the boiler cuts out - the temp display decreases a few degrees then the boiler kicks in again until 85 degrees, cuts out and so on and so on..... (presumably the 85 degree cut out is some kind of safety cut out)
the maximum temp the DHW dial goes to is 64 degrees so I'm guessing it going up to 85 degrees when switched on is not right??
could it be a dodgy NTC monitoring the temp incorrectly. I can see 3 NTC's in various parts of the boiler but I'm tempted to change the one next to the DHW heat exchanger to see if that does anything or do they all work together?
any thoughts?????
I have just moved into a house with an Vaillant 824/2 E boiler. Heating seems to work fine DHW was only getting luke warm. I noticed the CH flow pipe was getting hot when DHW was operated so changed to Diverter Valve. this seem to have solved the CH flow pipe problem and now DHW get super hot -
The problem is - is it now getting too hot??. The DHW temp dial seems to make no difference at all to the actual tap temp. When tap is switched on the boiler display heats up and up and up until it reaches 85 degress on the display then the boiler cuts out - the temp display decreases a few degrees then the boiler kicks in again until 85 degrees, cuts out and so on and so on..... (presumably the 85 degree cut out is some kind of safety cut out)
the maximum temp the DHW dial goes to is 64 degrees so I'm guessing it going up to 85 degrees when switched on is not right??
could it be a dodgy NTC monitoring the temp incorrectly. I can see 3 NTC's in various parts of the boiler but I'm tempted to change the one next to the DHW heat exchanger to see if that does anything or do they all work together?
any thoughts?????