Roberts Gorden UHA[X][S] 60 To Turn the Heater Off, Simple Troubleshooting, LED Diagnostic Codes

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

2.The automatic firing sequence will begin as described on Page 30, Figure 16. The heater will now operate automatically under the control of the on site controls.

11.4.2 To Turn the Heater Off

Set the thermostat to the "OFF" position. The burner will turn off immediately.

The fan will continue to run for 90 seconds. To restart, turn the thermostat above room temperature.

11.5 Simple Troubleshooting

Some possible reasons for the heater not operating are:

1.Gas supply not "ON".

2.Electricity supply not "ON".

3.The time and/or temperature controls are not "ON".

4.A limit switch may have operated. This may be caused by an interruption of the electrical supply, failure of the distribution fan or vent or

heat exchanger blockage.

If a temperature limit switch persistently trips, there is a fault which must be investigated by a contractor qualified in the installation and service of gas-fired heating equipment.

11.5.1 Simple Troubleshooting (Burner Faults)

If the burner fails to ignite for any reason, it will retry for ignition (four trials total). After four unsuccessful ignition trials, the control will put the heater into lockout for one hour.

Lockout should not occur during normal operation of the heater and indicates there is a fault condition which must be corrected. There is an LED light on the ignition control that flashes codes to assist in fault correction. See Page 34, Figure 20 for LED indication codes.

Figure 20: LED Diagnostic Codes

LED INDICATION	FAULT MODE
Slow Flash	Normal Operation - No call for heat.
Fast Flash	Normal Operation - Call for heat.
2 Flashes	Ignition Lockout - No flame detected.
3 Flashes	Airflow Fault - Pressure switch open or closed.
4 Flashes	Temperature Limit or
	Manual Reset Limit Switch Open
5 Flashes	Flame Sense Error - Gas valve not energized.
Steady On	Internal Control Failure

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