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750 Description ZM undefined hydraulic scheme
Cause: Issue with the zone manager hydraulic settings.
The zone manager(s) need defined. Use parameter 7.2.0 for zone manager 1 and parameter 7.5.0 for zone manager
2. Use the guide below to set correctly.
0 = Not defined - DO NOT USE.
1 = N/A – DO NOT USE.
2 = Mixed heating circuit module II.
3 = Mixed heating circuit module III
4 = N/A
5 = Direct heating circuit module II
6 = Direct heating circuit module III
Heat Generation Lock
Cause: External safety contact open circuit.
1. Check the link wire in the white connector (External safety contact) volt free connection on the side of the
PCB. If missing or damaged, replace the connector and link.
2. If a condensate pump safety switch has been wired into the white connector, check the operation of the
condensate pump discharge.
3. Check the condensate pump is discharging and the float is moving freely.
4. Check the safety switch of the pump. Free off or replace pump as required.
5. Check the cables and connectors from the condensate pump to the boiler. Use a multimeter to confirm
continuity. Replace as required.
6. If the above is all ok, replace the boiler PCB.
Blank display screen.
Cause: No power to boiler, internal fuses blown, display fault, PCB fault, fan or pump faults caused PCB to blow.
1. Check fuse at fused spur.
2. Check 230v into boiler.
3. Check continuity of fuses F1 & F2. Replace as required.
• These fuses protect both the live and neutral circuits only and are not specific to components or
internal circuits.
• Note the boiler is not polarity sensitive however polarity must be correct for safety.
4. Check fan resistances per 612 fault code. Replace fan as required.
• PCB will also need changed as fan has taken out board.
5. If fan ok, check pump for smell of burning. Replace pump and PCB.
6. If fan and pump are ok, replace PCB.
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