Potterton Prima Gas Valve

[bennythedip]

Just been to look at Potterton Prima that’s not lightning. Boiler goes through ignition sequence but there’s no gas coming through the valve to light the pilot. There’s 240v on the white wire going to the gas valve but nothing on the black. I presume there should be 240v on the black as well. If there’s no 240v does the pcb need replacing? Thanks for any help

 

[AMGasServices]

Do then pilot light ignite?

 

[bennythedip]

Do then pilot light ignite?

No there’s no pilot light. Forgot to mention it’s an Lpg prima. I’ve never worked on one before. I don’t think that you light the pilot manually with the control knob, think it should light automatically as part of ignition sequence.

 

[ShaunCorbs]

how many wires to the gas valve?

 

[bennythedip]

how many wires to the gas valve?

There’s 2 solenoids on the gas valve. The one on the left with the black wire has no voltage going to it. The one on the right with the white wire has 240v

 

[ShaunCorbs]

should be a pilot light due to two solenoids

 

[Chalked]

Auto pilot on those. Solenoids are low and high flame.

 

[bennythedip]

Auto pilot on those. Solenoids are low and high flame.

Does that mean that there should be 240v on the black wire going to the solenoid on the left? Is this the low flame? Thanks

 

[firemant]

Does that mean that there should be 240v on the black wire going to the solenoid on the left? Is this the low flame? Thanks

Where are you measuring t0?

 

[bennythedip]

Where are you measuring t0?

Measured between the black wire and earth and black wire and the blue neutral. Both are zero

 

[Chalked]

Start by cleaning pitot. Then check aps

 

[bennythedip]

The

Start by cleaning pitot. Then check aps

ignition sequence runs, fan runs, power goes to solenoid on the right, electrodes start sparking but there’s no gas coming through valve

 

[Elgordo]

Check the resistance of the coil- remove the wires first -if it’s open circuit you can change coil I think on these .

 

[Harvest Fields]

Cannot remember this boiler. (Brain freeze) is this thenone woth the electrical plug on the front so you can plug the gas valve into to see if it opens?

 

[bennythedip]

Check the resistance of the coil- remove the wires first -if it’s open circuit you can change coil I think on these .

I took a wire off the white lead which has 240v on it and jumpered it onto the black wire to see if the solenoid would open and it opens ok as you can hear it and smell the gas coming through so I think the solenoid is ok, it’s just there doesn’t seem to be 240v going to it to fire it. I’m wondering if the pcb is the problem if it’s not sending out the 240v

 

[bennythedip]

Cannot remember this boiler. (Brain freeze) is this thenone woth the electrical plug on the front so you can plug the gas valve into to see if it opens?

No there’s no plug but I took a wire off the white lead which has 240v on it and jumpered it onto the black wire to see if the solenoid would open and it opens ok as you can hear it and smell the gas coming through so I think the solenoid is ok, it’s just there doesn’t seem to be 240v going to it to fire it. I’m wondering if the pcb is the problem if it’s not sending out the 240v

 

[Harvest Fields]

If there is no power to the valve and the valve opens. Does the fan run and APS

 

[bennythedip]

If there is no power to the valve and the valve opens. Does the fan run and APS

Yea, runs fine through ignition sequence, power on, fan runs, electrodes spark but there’s no gas coming through to light