Hi,
Looking for some advice on our boiler system.
Our have a Potterton Promax SL boiler combined with an unvented santon premium plus hot water system. I have a dual zone system so separate thermostats for up and down stairs and a separate hot water controller/scheduler.
The system is working fine in terms of requests for CH and HW.
However I’ve recently noticed some strange behaviour in that our boiler (in garage) was firing constantly approx every 5mins or so; it ignites and pilot light comes on, pump comes on and a few seconds later the boiler goes off whilst the pump runs for a few minutes and then goes off. This repeats every approx 5mins for about 1.5hr roughly speak starting at midnight thru to 1:30am. Now during then the CH and HW are all off, so no heat on radiators and the 2 zones valves are confirmed to be off (no led lights on the zone actuators)
As the boiler is in the garage, there’s a frosts stat attached (it’s tamper free) and there’s a there some thermostat attached to pipe work above the boiler (Honeywell L641B1004 set to below min setting).
I think the temp in the garage was around 7C at the time....
But question is why is the boiler firing so frequently? Is this normal behaviour?
If it was triggered by the frost stat, surely it would stay on until it reached temp and then switch the boiler off and not fire the boiler for 1–10secs, turn off and repeat every approx 5mins for about 1.5hrs?
Is there something wrong here? Or just normal operation. Would appreciate if someone could advise and explain what’s going on? I’m by no means technical in this areas as you can gather?
Thanks
hyeung
Looking for some advice on our boiler system.
Our have a Potterton Promax SL boiler combined with an unvented santon premium plus hot water system. I have a dual zone system so separate thermostats for up and down stairs and a separate hot water controller/scheduler.
The system is working fine in terms of requests for CH and HW.
However I’ve recently noticed some strange behaviour in that our boiler (in garage) was firing constantly approx every 5mins or so; it ignites and pilot light comes on, pump comes on and a few seconds later the boiler goes off whilst the pump runs for a few minutes and then goes off. This repeats every approx 5mins for about 1.5hr roughly speak starting at midnight thru to 1:30am. Now during then the CH and HW are all off, so no heat on radiators and the 2 zones valves are confirmed to be off (no led lights on the zone actuators)
As the boiler is in the garage, there’s a frosts stat attached (it’s tamper free) and there’s a there some thermostat attached to pipe work above the boiler (Honeywell L641B1004 set to below min setting).
I think the temp in the garage was around 7C at the time....
But question is why is the boiler firing so frequently? Is this normal behaviour?
If it was triggered by the frost stat, surely it would stay on until it reached temp and then switch the boiler off and not fire the boiler for 1–10secs, turn off and repeat every approx 5mins for about 1.5hrs?
Is there something wrong here? Or just normal operation. Would appreciate if someone could advise and explain what’s going on? I’m by no means technical in this areas as you can gather?
Thanks
hyeung