Roberts Gorden UHD[X][S][R] 400, UHD[X][S][R] 300 service manual TROUBLESHOOTING 13.1General, Start

UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 13: TROUBLESHOOTING

13.1General

START

Are gas & electrical	No	Turn on supplies.
supplies on?

Yes
Is ignition control showing a		Wait 10 - 15 minutes for
	YesYes	limit switch to cool. Does	Yes
"4 flashes" LED code?
		fan stop running?
		No
		Replace temperature limit
		switch.
No
Is ignition control showing a	Yes	Burner has locked out due
		to ignition failure. Use
"2 flashes" LED code?		Troubleshooting for Automatic
		Ignition Burner Systems
		section to test burner.
No
Does the flue blower run?	No	Use Troubleshooting for
		Flue Blower section to test
		fan.
Yess

WARNING

Explosion Hazard

Installation, service and annual inspection must be done by a contractor qualified in the installation and service of gas-fired heating equipment or your gas supplier.

Turn off gas and electrical supplies before performing service or maintenance.

Failure to follow these instructions can result in death, injury or property damage.

Fan and limit switch are operating normally.

With external controls (i.e.		Has burner “Locked Out”? No
thermostat) on, does the No
burner continue through the
heating cycle?
		Yes
		Use Troubleshooting for
		Automatic Ignition Burner
		Systems section to test burner.
Yes
Heater Operating		If problems persist, contact
	No	Roberts-Gordon LLC at
TROUBLESHOOT ENDS.		www.rg-inc.com

The limit switch has tripped. See Manual Reset No

Limit Switch Figure.

Yes

Ensure air flow through

heat exchanger is

appropriate per the rating

plate.

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