THERMAFLOW LTD | THERMAFLOW® ELECTRIC COMBINATION BOILER |
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3.1.1 Fault: No domestic hot water or central heating
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Is there ~230-240V at the 24HR supply?
No
Yes
Check Fuse, MCB or Meter for correct
operation
Is there ~230-240V at the off peak supply?
No
Yes
Check Fuse or MCB
Is system pressure above 150 KPA (1.5 Bar)?
No
Yes
Increase Pressure
Is there continuity through 2
nd
stage and 3
rd
stage master
high limit manual re-set safety thermostats?
No
Yes
Re-set or replace thermostat
Is there continuity through both contactors?
No
Yes
Replace Contactor(s)
Is there ~230-240V at each heating element and
continuity through thermostats within?
No
Replace thermostat as necessary
Is there continuity through low pressure switch?
No
Yes
Replace low pressure switch
Is the off peak control in the on position?
No
Yes
Turn on both channels
