64659-001 REV. A 07/06/18
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Diagnostic Lights
The iHEAT control provides 5 diagnostic lights that display the status of the iHEAT system and aid in
diagnosing possible system component problems during the repair process. The lights and their
functions are:
Flash – Flashing light indicates the control is functioning properly.
T-input – Each time the appliance is turned on, the control verifies an input signal from the thermostat.
A solid light indicates the thermostat signal was verified upon start-up. A flashing light indicates a
problem with the thermostat signal.
Valve – The control contains a set of contacts used to provide power to the ignition control. The Valve
light indicates the position of the relay contacts; illuminated when the contacts are closed, and off when
the contacts are open. A flashing light indicates that the board’s on/off feature has turned the valve off.
The valve contacts will open when an abnormal condition is sensed: combustion air blower RPM out of
spec, either the line voltage or the 24 volt inputs to the iHEAT control are absent, the iHEAT control is in
calibration mode, or the thermostat signal is absent upon start up.
Blower – The Blower light illuminates when the combustion blower is operating properly. A non-
illuminated Blower light indicates: a bad electrical connection between the combustion blower and the
iHEAT control, a bad motor on the combustion blower, or an absence of the line voltage or 24 volt
inputs to the iHEAT control.
24V/CAL – This light serves two purposes. During the normal run mode, illumination of this light
indicates that 24 volts AC is present at the 24 Vac connection to the iHEAT control. During the
combustion air blower calibration, this light indicates status of the calibration process. A flashing light
indicates calibration is occurring; a solid light indicates the calibration process is completed.
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