Hi Everyone
I've searched for any clues to this one but coming up short.
Boiler was working fine was running low (half temp) on ch dial...
External controls running ok.
Then boiler starts to over heat.
Ch kicks in water heats but not going anywhere, pump red hot boiler locks out
Display shows water temp rising to 90 even when dial is only at 6 o'clock
Pump head replaced, now can hear pump running but same problem, feed into the pump
Is too hot to touch, pump is too hot to touch, pipe work after pump is hot for approx 6 inch. ( probably heat transference
Hot water works fine
No previous blockage as far as aware, magna clean on system, boiler fitted Feb 2014
Only two things that come to mind are
Change whole pump with auto vent rather than just pump head or blocked heat exchanger??
Other fact not stopping when reaches dial set temp rises to 90 then kicks out. Last time I moved the ch dial on panel it went to max 30 not 80 which seemed a bit strange.
Would really appreciate any input!
I've searched for any clues to this one but coming up short.
Boiler was working fine was running low (half temp) on ch dial...
External controls running ok.
Then boiler starts to over heat.
Ch kicks in water heats but not going anywhere, pump red hot boiler locks out
Display shows water temp rising to 90 even when dial is only at 6 o'clock
Pump head replaced, now can hear pump running but same problem, feed into the pump
Is too hot to touch, pump is too hot to touch, pipe work after pump is hot for approx 6 inch. ( probably heat transference
Hot water works fine
No previous blockage as far as aware, magna clean on system, boiler fitted Feb 2014
Only two things that come to mind are
Change whole pump with auto vent rather than just pump head or blocked heat exchanger??
Other fact not stopping when reaches dial set temp rises to 90 then kicks out. Last time I moved the ch dial on panel it went to max 30 not 80 which seemed a bit strange.
Would really appreciate any input!