POTTERTON PERFORMA 24 ECO HE problem

[Mbrgeordie]

Hi all, am new to the site so hopefully posting correctly.....

I have a Potterton Performa 24 Eco HE which has been installed for 2 years.

Wouldn't switch on this morning - no lights illuminating. Checked:

Power in 240V no probs, switch fully working, timer ticks away, turn the hot water on pump starts (I think its the pump, something trys to kick in).

Taken out the PCB - no visual burns or marks. Should I buy and replace the PCB or is there something else I should check?

Any help much appreciated

 

[Mbrgeordie]

Have rang Potterton, the tech guy mentioned the possibility of a problem with the neutral power supply.

Have checked the neutral and get a high resistance earth to neutral.

Have disconnected the feed and re-wired straight to a socket - low resistance but still no difference????

Could this have created the problem? 2 years for a PCB seems very low.

 

[powell30]

You have not told us if the fan spins??

Does it?

Could be aps, fan or board

 

[Mbrgeordie]

Hi Powell30,

There is no noise when the system has power.

The only time I here a noise (like a fan or pump) is if I run a hot water tap or activate the central heating - this comes from inside the boiler area. Have take off the front cover but cannot locate the noise.

When it was working you'd switch the heating on there would be a noise then you would here the gas ignite to heat the system. This first noise is what I hear.

Nige

 

[Mbrgeordie]

Just checked again and the fan definitely doesn't spin.

There is a transformer above the fan feeding the power to it. The fans shaft also has external fans one above and one below the transformer, these do not spin.

 

[Mbrgeordie]

Is the APS the Air Pressure Switch?

I can't get to it easily but the reading shows no continuity across pins 21 & 27 of M5.

 

[Mbrgeordie]

I ordered a PCB yesterday just in case. It has just arrived so put it in.

I now have power light and flame failure light on constant and burner on light flashing 1-2 secs. Couldn't find anything online so just went back and checked the switches while it was on.

Pressed the microswitch on the gas valve and the lights went out apart from the power light. Clicked reset for 5 secs then back on and all OK

I can now start to remove the 10 layers of clothing....