16 Heat Flow
Mk8 MM Manual Page | 294
16.8 Faults
The table below show the faults which are directly related to the heat flow function.
Temperature Sensor T1 Fault
Fault or no comms with T1 sensor
•
Check wiring and screen on terminals –and T1
Temperature Sensor T2 Fault
Fault or no comms with T2 sensor
• Check wiring and screen on terminals – and T2
Temperature Sensor T3 Fault
Fault or no comms with T3 sensor
• Check wiring and screen on terminals – and T3
Fault or no comms with make up flow meter
• Check wiring and screen on terminals F- and MF
Condensate Flow Meter Fault
Fault or no comms with condensate flow meter
• Check wiring and screen on terminals F- and CF
Coil Temperature Shutdown
Threshold
Expansion option 131 threshold has been
exceeded
• Check boiler’s coil temperature
• Check expansion option 131.
Exhaust Temperature Shutdown
Threshold
Expansion option 131 threshold has been
exceeded
• Check the exhaust gas temperature
• Check expansion option 131.
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