Roberts Gorden UHD[X][S][R] 125, UHD[X][S][R] 75 service manual Troubleshooting 13.1 General

SECTION 13: TROUBLESHOOTING

SECTION 13: TROUBLESHOOTING 13.1 General

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.

START

Are gas & electrical	No
supplies on?
Yes
Is ignition control showing a	Yes
"4 flashes" LED code?

No

Turn on supplies.

UHD 75: Press in reset

button on manual reset limit switch. UHD 100 - 125: Wait

10 - 15 minutes for limit Yes switch to cool. Does fan

stop running?

No

Replace temperature limit

switch.

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.

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
With external controls (i.e.	No	Has burner “Locked Out”? No
thermostat) on, does the
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 Replace limit switch. Limit Switch Figure.

Yes

Ensure air flow through the

heat exchanger is

appropriate per the rating

plate.

31