My Potterton Puma 80e keeps going to lockout when trying to ignite. However, if I keep pressing the reset button it will eventually light - sometimes takes 10 minutes or more of resetting for it to fire.
This is worse in the morning when the system hasn't been used for several hours. If it's only been a short time since it was last used the boiler ignites straight off.
As per the Fault Finding in the manual.....
Yes the red light comes on the modulator board
Yes the fan comes on
Yes there is a good clean spark
Yes the overheat stat is closed (put a multimeter across it to check)
Yes there is continuity across GV1 and GV2 solenoid valves
That's where the troubleshooting ends...
Another odd thing is the DHW flow at the tap. Before the boiler fires the flow rate is quite poor. When eventually it does fire there's a sound from the boiler like something filling up and the flow rate at the tap increases significantly.
Once fired up and hot the DHW flows about 9.5 l/min which is about right for this boiler.
I'm at a bit of a loss here. As it is sparking I suspect it is something to do with the Gas Valve. But why would it eventually light and be fine if that were the case?
I notice the GV3 solenoid has a circuit to the overheat stat, is it possible that although the stat is showing continuity that the resistance through it is too high? Anyone know what it should be?
I have no intention of messing with the GV and it's an expensive part to replace! So any ideas would be great...
Cheers
Graham
This is worse in the morning when the system hasn't been used for several hours. If it's only been a short time since it was last used the boiler ignites straight off.
As per the Fault Finding in the manual.....
Yes the red light comes on the modulator board
Yes the fan comes on
Yes there is a good clean spark
Yes the overheat stat is closed (put a multimeter across it to check)
Yes there is continuity across GV1 and GV2 solenoid valves
That's where the troubleshooting ends...
Another odd thing is the DHW flow at the tap. Before the boiler fires the flow rate is quite poor. When eventually it does fire there's a sound from the boiler like something filling up and the flow rate at the tap increases significantly.
Once fired up and hot the DHW flows about 9.5 l/min which is about right for this boiler.
I'm at a bit of a loss here. As it is sparking I suspect it is something to do with the Gas Valve. But why would it eventually light and be fine if that were the case?
I notice the GV3 solenoid has a circuit to the overheat stat, is it possible that although the stat is showing continuity that the resistance through it is too high? Anyone know what it should be?
I have no intention of messing with the GV and it's an expensive part to replace! So any ideas would be great...
Cheers
Graham