Basic megaflo compact. Strange issues, no hw.

[armyash]

Went to this job today and was there quite a while, it's a baxi boiler, unvented cylinder upstairs.

I get get there, boiler works fine on ch, put how to constant nothing, light comes on at programmer but no 'click' sound. So quick job swap programmer over - no change.

but if I turn he to constant, divertor powers over. Got 240 between earth and orange and also at grey. So electrically everything seems ok. Just the boiler won't fire.

Another thing, with old programmer divertor does not power over. So this at least to me proves dodgy programmer plus another fault.

With ch running and hw valve held open cust will have hw.

technical were stumped, they said there is no reason the boiler shouldn't fire following these tests. He said try changing the hydraulic pressure sensor. Have ordered this but not entirely confident this will solve the issue.

could there still be a prob with the divertor? Actually leaning toward pcb myself but tech said it can't be that.

Also pressure on boiler is fine, and no error codes.

 

[kris]

Im maybe getting mixed up but is it a baxi system boiler with 3 way zone valve ash ?

 

[kris]

Check the cylinder stat os ok as if knackered then it wont bring the boiler on but if you manually open and put on ch then it will heat the hw,

 

[armyash]

It's a system boiler with unvented cylinder.
No cyl stat - unless it's built in somewhere I can't see but cyl stat is a possibility, if there is one.

There is a separate electrical thing on the cylinder something about the element and something to do with the boiler but tech said can't be those.

2 2 port div valves

 

[armyash]

Boiler has a pressure gauge and filling loop too.

I'm getting more confused the more I think about it

 

[kris]

The element is the thermostat army, it will be wired to the 2 port valve to tell it to close when water temp is reached,

 

[armyash]

This the type of cylinder

 

[kris]

some unvented tanks the stat is next immersion and others come with a litlle element /phiall thats inserted into a sock and bolted to side of tank but vthere will be a cyl stat

 

[armyash]

The element is the thermostat army, it will be wired to the 2 port valve to tell it to close when water temp is reached,

Ok that makes sense, not sure how to test, there was a reset but couldn't do anything with it. Wasn't getting voltage there though.

 

[armyash]

some unvented tanks the stat is next immersion and others come with a litlle element /phiall thats inserted into a sock and bolted to side of tank but vthere will be a cyl stat

Looks I'll be going back, I was there ages bet it's a 2 min job lol