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Fault finding (level 2) continued
-Check with an Ohm meter and ensure flow switches operate
(contacts need to close when water flows). When you turn on tap
and you can hear the switches "click".
The best way to check the switch operation with a multimeter
-If the pressure differential switch works O.K. then check that the
over temperature cut-out(s) are not triggered.
-If the contact of one of the micro-switches remains closed the
heating won't stop when you close the tap, and it will trigger the
over-temperature cut-out to trip. In that case the micro-switch
needs replacement. Note there are various part numbers for
different models Hotruns
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