Baxi 105 he breakdown

[Jimmy18]

hey guys,
Had a call out today to a baxi combi that’s one of my dads friends. Got there and no heating or hot water. So took off the case and checked a few bits. Pump not running so checked power from pcb. 230v checked power at pump, nothing. Also when my ears pricked up a bit is when I looked at the condense trap and it was bone dry and the diverter valve is brand new and it’s all just been serviced apparently. I’m getting a bit of a bad feeling and don’t want to shell out £140 odd quid for a new pump and there’s something else going on but as the pump is my first port of call what choice do I have?

 

[Aire]

If your getting no power at the pump then the problem is before the pump.

 

[ShaunCorbs]

Is the micro switch making at the rear ?

 

[townfanjon]

Jimmy , gas safe ??

 

[Jimmy18]

Yeah course mate

 

[Jimmy18]

All controls are calling. Power at the board to the pump but no power at the pump. Not running in central heating only mode.

 

[Aire]

When you say no power at the pump, are you physically checking at the pump or just assuming because the pumps not running?

 

[Jimmy18]

When you say no power at the pump, are you physically checking at the pump or just assuming because the pumps not running?

No I’m checking the pump voltage. Zero volts

 

[Aire]

No I’m checking the pump voltage. Zero volts

Im no expert on the 105 but if you've got power to the pump at the pcb but no power at the pump, there must be a break in power between the pcb and the pump, so possibly faulty pcb or cable to the pump?

 

[Sharp Point]

No I’m checking the pump voltage. Zero volts

If there’s zero volts, it’s not your pump. You need to be looking further down the sequence

 

[Jimmy18]

I was of the thought that the sequence starts at the pump after calling via room stats etc.
I’ll check the cables tomorrow before fitting the new pump. I tried spinning the pump manually and couldn’t move it either hence why I’m thinking it’s the pump also

 

[Aire]

A seized pump? How longs the boiler been off for?
The sequence starts with the pump but if getting no power then it won't work. So check for continuity accross the cable, if all ok then I'd be thinking pcb.

 

[Riley]

Can I dive in here chaps. jimmy if you are gas safe please send your details (pic of front and back of your card) to either @ShaunCorbs @Harvest Fields or @Riley and we’ll get you in the gas safe section.

 

[Riley]

A cursory advisory guys. No boiler answers unless member has GSR badge not just on their say so

 

[Sharp Point]

The sequence starts with the pump .

Eh! And what brings the pump in

Telepathy?

 

[Harvest Fields]

Eh! And what brings the pump in

Telepathy?

He cannot see your answer mate. The post has been moved out of public eyes.

 

[Sharp Point]

He cannot see your answer mate. The post has been moved out of public eyes.

I know, it’s a post for Craig HF

 

[Harvest Fields]

Sorry mate. Misread that one. Not done that in a while.

 

[townfanjon]

Sorry mate. Misread that one. Not done that in a while.

Keep up at the back please

 

[Aire]

Eh! And what brings the pump in

Telepathy?

You know what I meant, obviously demand is first but in terms of boiler operation, the pump runs first.