Baxi neta tec 33kw combi 133 error

[Tommo25]

hi all,

Did a full strip down on baxi neta tec. Customer reported they were having trouble with e133. Boiler was pretty clean over all. Checked CO readings at Max, min and ignition stage all ok.
Electrode gap was 2-3 mm too big explained this to customer that it would need to be replaced at next service if they have no more problems.

The fault has came up this morning.
Baxi say that the boiler has a self calibrating gas valve working on two solenoids and that could be sticking. They say it’s not serviceable and the only way to test it is CO readings on FGA which I did and it’s fine.

I’ll be back in the next few days to change spark electrode. Any one got any ideas on checks I could run to prove it’s not the board/gas valve/ electrics?

Thanks in advance

 

[king of pipes]

I have changed a pcb on one for that reoccurring e133 fault . Kop

 

[Tommo25]

I’ve changed the electrodes and checked the resistance across gas valve so that should rule the gas valve out, boiler still bringing up fault. It is looking as though it could be the PCB. As it’s an intermittent fault how would I test it?
Thanks

 

[king of pipes]

I went through technical at baxi bud best give them a bell , new pcb solved the problem though .

 

[townfanjon]

Can be a nightmare that fault , last one I had I advised the customer to go on fixed price repair , he was there when the engineer came and the engineer put loads of parts on it , including gas valve and board .