Potterton Puma 80 & Hot Water Problem

[pers5579]

Can anyone advise me what the hell is wrong with my god damn boiler now please!

The Hot Water typically takes about 2 minutes to get hot. It then stays hot for around 2 minutes, then goes freezing cold, then repeats itself.

It only gets Hot and stays Hot IF the CH is switched ON, but when the CH is switched on the pressure is lower (presumably because the Boiler is worknig twice as hard) and you get a trickle of water.

Any suggestions greatly appreciated! Thanks

 

[twgas]

possibly diverter valve fault, wax capsule is stuck/broke so only letting minimal amount of water through, this may also not be enough to activate flow switch properly so water goes cold

 

[ChrisR]

Check diverter - turn CH off to allow pipes belw boiler to cool.
Run HW, see if flow pipe gets hot. If it does, Diverter needs replacing.

 

[pers5579]

I had the Diverter Valve Wax Capsule replaced about 3 months ago!

(At that point we had no CH).

But this problem was occuring before the Diverter Valve was replaced and continued afterwards. It was however, bearable, but now im getting rapidly fed-up of trickle-strength luke warm showers!

 

[ChrisR]

Have you got VERY hard water?
When you turn the tap on, the red light on the pcb should come on. Does it? To access that you'll have to take the front cover off, 2 screws underneath.

Do you have a multimeter? If so measure hot water sensor resistance.

 

[bengasman]

Could well be that your system is full of drab and the diverter is blocked again, see FAQ for soiled system