MEXICO SUPER RS485 IGINITION FAULT

[SPANNER2]

I have an intermittent problem with the boiler firing up and after replacing the wall mounted control panel it still persists. I have checked the main electrical feed from the control panel to the boiler and when the control panel is on and lit up there is no power going via the main cable to the boiler.
I keep turning on and off and eventually the boiler powers up.
Any ideas ?

 

[45yearsagasman]

Have you any zone valves on your system?

 

[SPANNER2]

Hi Pete, thanks for the reply. It is a sealed system and apart from one wall mounted thermostat in the hall that is it. I replaced the printed circuit board about 12 months ago due to the solenoid / gas valve not opening and it has been fine until now.

 

[45yearsagasman]

View media item 38425 View media item 44939
Anything like these on the system? View media item 86934

 

[SPANNER2]

Hi Pete, yes there are 2no like the one shown top left of your three photos. There is one fitted to the pipework coming from the pump and another on the pipework from / to the large hot water storage tank and both are set in the 'auto' position.

 

[45yearsagasman]

2 X 3port valves or 2 X 2port valves? Either way, I would suspect one of these is affecting the boiler via the internal micro switch.

 

[FiremanT]

2 X 3port valves or 2 X 2port valves? Either way, I would suspect one of these is keeping the boiler on via the internal micro switch.

Think you need to re-read the OP's question

 

[45yearsagasman]

DOH! To many liqueurs. You got any idea? Many faults like this are related to zone valves, either boiler stays on or operates intermittently, but I take your point. I've edited my previous reply. Hope that meets with your approval

 

[SPANNER2]

Afternoon Pete,

Apologies for delay in responding to your suggestion and just to confirm that you were correct it was the zone valve on the central heating pipework and the boiler is now running like new.

Cheers.

 

[45yearsagasman]

Thanks for the feedback.