IM-P661-02-US
TES Issue 2
17
Fault
Possible cause
Remedial action
Unit does not power up
Loss of incoming supply
Check incoming supply
Internal circuit breaker tripped
Check Q2
Loss of 24 Vac
Internal fuse blown
Check fuse F1
PT100 signal not
reading correctly
Field wiring fault
Check termination of 3 wire PT100
terminals and PT100 head
Faulty PT100
Check compensated resistance
No hot water
Isolation valve failed closed
Refer to the IMI for the isolation
valve and actuator
Control valve failed closed
Refer to the IMI for the control
valve and actuator
Steam trap failed closed
Refer to the IMI for the steam trap
5. Fault finding
Summary of Contents for SpiraHeat
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