Potterton Promax 24HE - My poor newborn baby needs heat!

[Beady]

Hi All,
Can you please help.

I have a Potterton 24HE boiler and I have the following problem;
When the timer (thermostat) tries to turn the boiler on the boiler doesn't always start up and I have to press the reset (lockout) button to start the boiler.
When the timer turns on the boiler there is 240 voltage going to the control board, I have checked that. I asked a few electrical friends and they said it could be a fault on the relay on the control PCB, so I changed my control PCB with a neighbour (has the same boiler new build houses 3 yrs old). his boiler still works fine and mine still has the same problem. so I would say the control PCB is o.k.

Can anyone let me know what else it could be?
Thanks for any advise?
Chris

 

[Agile]

The gas valve settings may be incorrect ( CORGI job ).

Or the ignition or flame detection electrodes may be wrongly positioned or faulty.

You seem to have a very helpful neighbour! Maybe he will let you take his electrodes too !

Tony

 

[tryitandsee]

Faulty flame sensor perhaps, not detecting a flame and locks out.

 

[tryitandsee]

Where's that third bus.

 

[Beady]

Don't get the bus joke

He is a good neighbour, I do cut his front lawn for him though!!

Sounds like I better get an expert in. So you both think it is probably those two faults then?

Thanks for your help.

 

[Agile]

If you have changed the PCB without too much difficulty then you should be able to change the ignition electrodes as well.

Be aware that opening the combustion chamber shoule be done by a CORGI or a competent person in their own home only.

You must judge if you are competent.

My enquiries indicate that many engineers have not had much experience of faults on this model yet as its relatively new.

Tony

 

[Beady]

Thanks Tony might give it a go for myself, don't want to use neighbours part for this. Do you know the best place to buy them?

Thanks,
Chris

 

[Doc955]

Beady, (or anyone!)

Did you ever get to the bottom of this? I have the same boiler which has had this problem (intermittantly) for nearly a year now. Sometimes the boiler acts dead unless you reset it, then it works perfectly. System pump is running, zone valves are set but no life from the boiler.

The control PCB was replaced earlier this year and it's not given any trouble, although it's only been used for HW for most of the summer. Now the cold weather is here again it's playing silly buggers once more.

Cheers.