Hello.
I have a Vailliant Turbomax 282E which is exhibiting some strange behaviour with regard to Hot Water supply. Central heating appears to be fine, but when DHW comes on, it comes on for about 20 seconds - then slowly the burner starts getting lower and lower until it is switched off. About 10 seconds later it fires back up.
It is as if a thermostat is switching the DHW off when it gets too hot, then regulates the burner until it is switched off - then as the cool water passes through the boiler, it is re-ignited to come back up to temperature.
Sometimes, the boiler doesn't come on at all - this seems to happen more often when the CH is switched off.
Looking at the installation and servicing guide, I see two thermostats - an NTC sensor and an overheat themostat. The NTC sensor is in the combustion chamber, and since CH seems to work fine with no cycling - i'm assuming this is ok (and also the manual says this is a highly reliable component).
So my other option is the Overheat thermostat.
Any comments on the above symptoms?
Thanks,
I have a Vailliant Turbomax 282E which is exhibiting some strange behaviour with regard to Hot Water supply. Central heating appears to be fine, but when DHW comes on, it comes on for about 20 seconds - then slowly the burner starts getting lower and lower until it is switched off. About 10 seconds later it fires back up.
It is as if a thermostat is switching the DHW off when it gets too hot, then regulates the burner until it is switched off - then as the cool water passes through the boiler, it is re-ignited to come back up to temperature.
Sometimes, the boiler doesn't come on at all - this seems to happen more often when the CH is switched off.
Looking at the installation and servicing guide, I see two thermostats - an NTC sensor and an overheat themostat. The NTC sensor is in the combustion chamber, and since CH seems to work fine with no cycling - i'm assuming this is ok (and also the manual says this is a highly reliable component).
So my other option is the Overheat thermostat.
Any comments on the above symptoms?
Thanks,