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Vokera Mynute 14SE Gas Boiler Faults, Problems and Fault Finding
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When we arrived we found the boiler had stopped working completely. We could hear the pump running so we eliminated the possibility of a blown fuse in the main isolating switch for the heating circuit.
This boiler uses a flow switch to prove pump operation before initiating the ignition sequence so we visually checked the operation of the flow switch. The push rod is in the differential pressure unit is out when the pump is not running and retracts when the pump runs. We found the push rod didn't move at all on pump speeds 1 or 2 and was not consistent even on pump speed 3 though when it retracted the boiler fired normally.
We rang Vokera Tech Services (08703 330220) to ask if there was any was to distinguish between a diaphragm fault (in the differential pressure unit) or a pump fault (worn pump providing insufficient pressure). Tech Services said we could check by removing the access plug at the end of the pump spindle (Grundfos 15.50 circulating pump) and trying to stop the spindle rotation using a large flat bladed screwdriver. He said it should not be possible if the pump was OK (the pump was set on speed 3). If the pump was OK we should suspect the diaphragm in the differential pressure unit or, possibly, a blockage in the differential pressure unit.
Since this was a system boiler working at 1˝ bar, this check didn't work for us as slackening the access plug released too much water (by now hot water) above the live electrics. With the boiler running, the entire radiator system had got evenly hot so the pump was an unlikely culprit and in a 9 year old boiler the diaphragm was quite likely. We changed the diaphragm in the pressure differential unit (it was perished and perforated) and resolved the intermittent problem.
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