Thermaflow TH12 - Fault: no Domestic Hot Water or Central Heating

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Fault: No domestic hot water or central heating
25
Is there ~230-240V at the 24HR supply?
No
Check Fuse, MCB or Meter for correct
operation
Yes
Is there ~230-240V at the off peak supply?
No
Check Fuse or MCB
Yes
Is system pressure above 60 KPA (0.6 Bar)?
No
Increase Pressure
Yes
Is there continuity through master high limit stat?
No
Replace Thermostat
Yes
Is there continuity through contactor?
No
Replace Contactor
Yes
Is there ~230-240V at each heating element and
continuity through thermostats within?
No
Replace or re-set as necessary