Thermaflow TH12 - Fault:no Central Heating, but Hot Water at Taps

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Fault: No central heating, but hot water at taps

Is there continuity through master high limit stat?

Yes

Replace Thermostat

Is there continuity through contactor?

Yes

Replace Contactor

Is there ~230-240V at each heating element and

continuity through thermostats within?

Yes

Replace or re-set as necessary

Are external controls calling for heat?

Yes

Adjust the setting

Is temperature above setting on aqua stat?

(Should be set to 30

Yes

Re-check when temperature increases

Check thermostat and lock shield Valves on radiators are

open & calling for heat

Is there ~230-240V and continuity at terminals of the

aqua stat?

Yes

Check ~230V Supply

Is pump impeller turning?

Yes

Replace central heating pump

Is there ~230-240V supply at central Heating pump?

Yes

Check for faulty external controls