central heating pin not coming out baxi 105e

[paulcroad]

hi,

hope someone can help when the central heating is switched on the pin is not coming out and connecting to the micro switch to fire it up does anybody no what this could be, also when the hot water is switched on it heats up to full temp and then cuts out and the central heating sensor warning light flashes for a bit then it re-fires up. any help please thanks paul

 

[DP]

Muck and dirt in the system water.

 

[45yearsagasman]

As above and also in the boiler as well.Pump proving diaphragm worn,and pump cream crackered is also a possibility.Return filter blocked.I could go on.Do you intend to DIY?

 

[paulcroad]

hi,

thanks both for your replys, had pump replaced 12 months ago, changed hot water diaphragm bout 6 months, i cleaned return filter fews day ago before this started happening any clues on wot to do, yes be diy if i can bit short of cash at the mo. thanks

 

[45yearsagasman]

Have you changed the pump switch diaphragm? It's the smaller one on top of the diverter valve.

 

[paulcroad]

it that the one where the other micro switch is

 

[45yearsagasman]

There's the front switch which is hot water and the one on the top is pump proving switch.In CH mode that is the only one that operates.

 

[paulcroad]

thanks, i've changed the ch diaphragm this morning but the ch pin is still not coming out but the ch does fire up when i press the switch if i don't press the switch the pump/ low pressure light flashes, so is that the pump knacked