Main Combi 30 HE

[davlin]

Hi there
Can anyone advise.
My boiler is only 2 years old and my hoy water supply is not constant.
with the hot tap on full my boiler is at full fire for 30 seconds then goes off for 10 seconds and so on. Central hesting side seams fine.

Cheers Davlin.

 

[Billy Bob Bob]

likely diaphragm faulty,obviously cant tell you how to repair it but a easy job for a competent plumber or gsr engineer

 

[Puddle]

was system flushed out when boiler replaced,sounds like maybe plate heat exchanger blocked,overheating

As said will have to get someone in

 

[wnjswozo]

diaphram washer,faulty high limit stat,pcb

 

[newbie1]

i would guess at plate heat exchanger blocked

 

[davlin]

It was a complete new system and fernox added. Tried changing DHW diaphragm in diverter valve, and temp probe,made no difference.
When boiler fires up on DHW only, pipe to C/H supply is boiling hot.

 

[Toddyplumb]

Try local gas safe engineer or Baxi website for a local fitter.
You have been without hot water for a week now and have just guessed at parts to change, not good.

 

[davlin]

Thanks Lads

Blocked plate heat exchanger, all ok now

 

[Toddyplumb]

Poor install on a new system then ?

 

[newbie1]

like i said prob not flushed and no water softener on incoming