Roberts Gorden UHD[X][S][R] 225, UHD[X][S][R] 300 Troubleshooting for Flame Supervision System

UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

13.3 Troubleshooting for Flame Supervision System

To measure flame current, connect a 0 - 50 μA DC meter in series with the flame probe. If the meter reads negative values, then reverse the test leads.

START

Connect a DC ammeter in series with the flame probe.

Is the flame present and at least 1 μA DC flame current?

Yes

Is there a current flowing in the flame probe circuit with no flame present?

No

Does “lockout” occur when there is a flame present?

No

Heater Operating

TROUBLESHOOT ENDS.

	Use General
No	Troubleshooting section to
	trace the fault.
	Is the connecting lead		Repair or replace as
Yes	damaged? Is the flame probe	Yes
			required.
	damaged or touching earthed
	components?
	Is inlet burner gas pressure
Yes	correct? Is live and neutral	Yes	Replace ignition control.
	polarity correct? Is
	flame probe circuit correct?

No

Repair or replace as

required.

If problems persist, contact

No	Roberts-Gordon LLC at
	www.rg-inc.com

NOTE: Minimum flame probe current 1 μA DC. Typical flame probe current 3-5 μA DC.

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