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WHAT COULD BE WRONG WITH MY VAKERA COMBI LINEA 24?

I HAVE ABOVE COMBI BILER LINEA 24 IT GIVES MILD HOT WATER AND HEATING BUT SAME TIME IT'S KEEP CUTTING OFF
EVERY 5 SECOND os less .ALSO PRESURE BULD UP VERY SLOW.(DOES NOT LOSS PRESURE WHEN REACHES TO NORMAL)

I HAVE REPLACED HEAT EXCHANGER BUT NO DIFFERANCE.
Karsan, March 2008
yes
all earth and polarity fine.

karsan, March 2008
Please explain what do you mean ch termister

karsan, March 2008
try changing the ch termister

T, March 2008
yes

karsan, March 2008
yes.

All reading on display are ok.

karsan, March 2008
Cutting out every 5 sec or less....

Have you checked polarity.....?
Is your boiler properly earthed? (not wired earth, gas pipe earthed/bonded)

T, March 2008