hello,

I hope someone might be able to help with an intermittent problem we
have with our 7 year old Potterton Prima F 40 boiler.

Every once in a while, whilst running it makes a continual clicking
noise for approx 3-5 seconds which causes some vibration (is it one of
the solenoids failing?). As I said it's intermittent and sometimes it
can occur for a second then go away.

I've had an engineer look at it but it does'nt repeat the fault
whilst he's there! He changed the main burner soleniod because it also,
occasionally, lights the pilot light but does'nt fire up the main
burner.

Any theories as to what the engineer could change would be gratfully
received - new PCB perhaps? I'm also concerned it might be dangerous.
kind regards,

Mani

On Thu, 27 Jan 2005 08:40:25 -0800, Mani wrote:

hello,

I hope someone might be able to help with an intermittent problem we
have with our 7 year old Potterton Prima F 40 boiler.

Every once in a while, whilst running it makes a continual clicking
noise for approx 3-5 seconds which causes some vibration (is it one of
the solenoids failing?). As I said it's intermittent and sometimes it
can occur for a second then go away.

I've had an engineer look at it but it does'nt repeat the fault
whilst he's there! He changed the main burner soleniod because it also,
occasionally, lights the pilot light but does'nt fire up the main
burner.

Any theories as to what the engineer could change would be gratfully
received - new PCB perhaps? I'm also concerned it might be dangerous.
kind regards,

I would hazard a guess that the micro switch in the air pressure switch is
iffy.
Normally there is a fair bit of hysteresis in the air pressure switch but
if the switch is bad it might be making bad contact this would make a
clicking noise on the main relay on the main control board.



--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html

In message .com, Mani
writes
hello,

I hope someone might be able to help with an intermittent problem we
have with our 7 year old Potterton Prima F 40 boiler.

Every once in a while, whilst running it makes a continual clicking
noise for approx 3-5 seconds which causes some vibration (is it one of
the solenoids failing?). As I said it's intermittent and sometimes it
can occur for a second then go away.

I've had an engineer look at it but it does'nt repeat the fault
whilst he's there! He changed the main burner soleniod because it also,
occasionally, lights the pilot light but does'nt fire up the main
burner.

Any theories as to what the engineer could change would be gratfully
received - new PCB perhaps? I'm also concerned it might be dangerous.
kind regards,

Is your HT lead shorting to the case ?

--
geoff

In message .uk, Ed
Sirett writes
On Thu, 27 Jan 2005 08:40:25 -0800, Mani wrote:

hello,

I hope someone might be able to help with an intermittent problem we
have with our 7 year old Potterton Prima F 40 boiler.

Every once in a while, whilst running it makes a continual clicking
noise for approx 3-5 seconds which causes some vibration (is it one of
the solenoids failing?). As I said it's intermittent and sometimes it
can occur for a second then go away.

I've had an engineer look at it but it does'nt repeat the fault
whilst he's there! He changed the main burner soleniod because it also,
occasionally, lights the pilot light but does'nt fire up the main
burner.

Any theories as to what the engineer could change would be gratfully
received - new PCB perhaps? I'm also concerned it might be dangerous.
kind regards,

I would hazard a guess that the micro switch in the air pressure switch is
iffy.
Normally there is a fair bit of hysteresis in the air pressure switch but
if the switch is bad it might be making bad contact this would make a
clicking noise on the main relay on the main control board.

It's also a known fault with the pcb, but he should check the HT lead
first
--
geoff

hello All,

thanks for the replys. It turned out to be a dry joint on the PCB.
Luckily the fault appeared whilst the engineer was present. Resolder
the offending joint and bingo - no more clicking & vibration.

thanks.