Thermo Products 36)- 80 User Manual
All installations and services must be performed by qualified service personnel.
VIII. TROUBLESHOOTING
: Power must be disconnected before servicing.
Refer to the appendices of this manual for an electrical schematic, a connection
diagram, flowcharts to assist in troubleshooting, product specifications, and a
replacement parts list follow for this appliance.
A. Heating System:
diagram, flowcharts to assist in troubleshooting, product specifications, and a
replacement parts list follow for this appliance.
A. Heating System:
Qualified HVAC and cooling contractors must perform all service.
NOTICE: Before troubleshooting, familiarize yourself with the Initial Startup,
Checkout Procedure, and Heating System Troubleshooting Flowchart.
Checkout Procedure, and Heating System Troubleshooting Flowchart.
To assist in troubleshooting the heating section of this appliance, it is equipped with
an integrated safety and ignition control with diagnostics. These diagnostics include
an indicator light that relays the operational status of the control and can help in
diagnosing the condition of the flame sensor.
an integrated safety and ignition control with diagnostics. These diagnostics include
an indicator light that relays the operational status of the control and can help in
diagnosing the condition of the flame sensor.
Diagnostic Features
The Honeywell brand model R7184B (or alternate R7184U) safety and ignition
control module used on this unit continuously monitors the operation of the heating
system. If an abnormal condition occurs, the LED light on the control will rapidly
flash indicating the operational status of the unit. In event this control
malfunctions, the entire control should be replaced. It is not field-repairable.
control module used on this unit continuously monitors the operation of the heating
system. If an abnormal condition occurs, the LED light on the control will rapidly
flash indicating the operational status of the unit. In event this control
malfunctions, the entire control should be replaced. It is not field-repairable.
In the event of an operational failure of the burner system, the rate of flashes, if any,
of the ignition control module LED should be noted, before turning off power to the
unit. Otherwise, power to the heating section will be interrupted and the control LED
will not furnish the diagnostic flashing. It may be necessary to restart the furnace and
have the failure occur again. For the model R7184B, under normal operating
conditions, the LED will be continuously lit while the burner is operating.
If either control has sensed a flame failure, which was uncorrected by initiating
another trial-for-ignition, the control will cease ignition trials and shutdown the
burner, or “lockout”. The LED will continuously flash at a high rate (approximately
1/2-second “on”; 1/2 second “off”, for the model R7184B.
of the ignition control module LED should be noted, before turning off power to the
unit. Otherwise, power to the heating section will be interrupted and the control LED
will not furnish the diagnostic flashing. It may be necessary to restart the furnace and
have the failure occur again. For the model R7184B, under normal operating
conditions, the LED will be continuously lit while the burner is operating.
If either control has sensed a flame failure, which was uncorrected by initiating
another trial-for-ignition, the control will cease ignition trials and shutdown the
burner, or “lockout”. The LED will continuously flash at a high rate (approximately
1/2-second “on”; 1/2 second “off”, for the model R7184B.
: If the appliance fails to relight after resetting the primary control twice
contact a qualified service company. DO NOT continue to reset primary control.
The operational condition of the flame sensor, or “cad cell”, can be checked by
depressing the reset button on the control module, while the burner is operating.
Count the number of flashes of the LED and compare them to the table below.
The operational condition of the flame sensor, or “cad cell”, can be checked by
depressing the reset button on the control module, while the burner is operating.
Count the number of flashes of the LED and compare them to the table below.
57