Thermaflow TH12 - Fault:central HEATING but no Hot Water at Taps

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Fault: CENTRAL HEATING BUT No hot water at taps
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Is the automatic air eliminator on top of the boiler in the
open position causing an air trap in the top of the boiler?
No
Yes
Open the small screw cap on top of the
auto air eliminator
Is green neon indicator illuminated in enclosure 10- 2 as shown
in schematic diagram 1.8.1.When hot water is flowing?
No
Yes
Open and close hot water tap repeatedly. I
f
fault not resolved replace flow Switch
Is there ~230-240V across terminals A1 & A2 on relay?
No
Yes
Open and close hot water tap repeatedly. I
f
fault not resolved replace flow Switch
Is there ~230-240V at domestic pump terminals or at terminal
number 14 on flow switch relay? (Enclosure 10- 2)
No
Yes
Replace the relay
Is domestic pump operating correctly? Are the pump
valves in the open position?
No
Yes
Open the pump valves. If they are
open replace the pump
Is there circulation through the primary side of the plate
heat exchanger?
No Disconnect primary flow from plate heat
exchanger and check for blockage
(Rare Occurrence)