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Central Heating boiler safety cut out
QUESTION:The temp is 65 degrees on the flow pipe. I've tried closing the
by-pass completely and opening the HW circuit fully, hoping that the
HW circuit will act as a by-pass.
If I put the pump on full speed then water begins to flow into the FE
tank - quite alot too. I have to keep the pump on medium to avoid
this and also ensure that by-pass and HW coil are not both fully open
(if they are water still comes out of the FE tank, but just a trickle)
How do I check the motorised valve? When the room thermostat calls
for heat I can hear the MV opening so I assumed that it works.
Is the boiler thermostat something that I (a novice) could do? Do I
have to be corgi registered or something?
ANSWER: Sounds like any of the following:
1) Over sensitive over-heat cut out. This should operate around 85C + not
65C.
2) Pump over run thermostat faulty - followed by temporary overheating in
the boiler.
It can't be the main thermostat 65 for a middling setting is just fine.
Sounds like the general health of the system is other wise OK.
I doubt whatever the boiler is that the parts to fix this will be over 20
quid.
This is about as difficult as delving into the washing machine it all
depends on your level of experience with dealing with electrical
appliances repairs.
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