80
NO HEAT
Set for On Mode (see Frame 28)
no
Is the boiler set for On Mode?
yes
Is there 230Vac at (A)?
There is no Switched Live to the Boiler.
Ensure voltage is supplied to the boiler by
correcting external wiring
no
yes
Does wiring to Header Pump have continuity and is to
the correct connections?
Rectify wiring to Header pump
no
yes
Is the Header pump stuck
Free the Header pump
yes
yes
Does the Header Pump operate?
no
yes
Does wiring to Module Pump have continuity and is to
the correct connections?
Replace the Header Pump
no
yes
Is the Module pump stuck
Rectify wiring to Module pump
no
yes
Free the Module pump
Replace the Module pump
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