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Troubleshooting table
Symptom
Display does not come on.
Temperature settings do not
change.
Heating does not come on.
Thermostat is calling for heat
but no heating is running.
Heat does not turn on.
If the appliance cannot be made to perform correctly please contact Rinnai (0800 TO RINNAI)
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0800 76 746 624.
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10 | iHeat thermostat installation guide: 12064-A 01-13
Possible cause
Thermostat is not being powered.
The upper or lower temperature limits were
reached.
The keypad is fully locked.
Thermostat minimum off-time is activated.
System selection not set to heat.
System type selection is incorrect.
Heating equipment is not operating.
Heating equipment failure.
Loose or broken wire connection between
thermostat and heating equipment.
Action
Check for 24 Vac between C and RC.
Check temperature setpoints.
Check setup numbers 0600 and 0610; modify as needed.
Check setup number 0670 to change keypad options.
Wait five minutes for the system to respond.
Set system selection to correct position.
Check setup number 0170 and make sure 8 is selected.
Check wiring.
Check setup number 0170 and make sure 8 is selected.
Verify operation of equipment in system test mode.
Check for 24 Vac at the equipment on the secondary side of
the transformer between power and common. If voltage is not
present, check the heating equipment to find the cause of the
problem.
Check for 24 Vac between the heat terminal (W)) and transformer
common. If 24 Vac is present, the thermostat is functional. Check
the heating equipment to find the cause of the problem.
Check for 24 Vac between the heat terminal (W)) and transformer
common. If voltage is not present, check wire connection (loose
or broken) between the thermostat and the heating equipment.
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