Service manual

SECTION 12: TROUBLESHOOTING
47
Contact
Roberts-Gordon
at www.rg-inc.com
TROUBLESHOOT ENDS
If the problem persists, contact your
ROBERTS GORDON
®
Independent Distributor.
Replace
flame
sensor.
Is the flame
sensor dirty?
Repair/
Replace.
Repair/
correct wiring.
Repair/
correct wiring.
Repair/
correct wiring.
After igniter warm-
up period, does the
valve click?
Does the
burner light?
Does the burner
stay on?
Does burner run
until the call for
heat ends?
Were the gas lines
purged of air?
* Check inlet gas cock
* Contact gas company
* Adjust the regulator
Is the continuity
of the ground
wire OK?
Repair/
correct wiring.
Check the continuity
of the ground wire.
Check the thermostat.
purge gas line.
Check outlet gas pressure during
ignition period. Is the natural gas pressure
3.5" W.C.? (LP pressure 10.5" W.C.?)
Adjust to proper
pressure.
See Section 12.3.
Are L1 and L2
reversed?
Check for proper orifice.
Check for proper air plate.
Is the
wiring at the
SmartValve
®
II
OK?
Are the wires to
and from the
SmartValve
®
II OK?
Replace
SmartValve® II.
Is the insulation
on the flame sensor
lead OK?
Replace wires.
Is the flame
sensor positioned
properly?
Clean
flame
sensor.
SmartValve® II ignition system control switch must be in
the on position. Check inlet gas pressure during ignition
period. Is the natural gas pressure at least 4.6" W.C.?
5.0" W.C. for model CTH2-175 (LP pressure 11" W.C.?)
YES
YES
NO
NO
NO
YES
NO
YES
NO
YES
YES YES YES YES
NO
NO
NO
NO
YES
YES
NO YES NO YES YES
NO
YES
NO
NO
OR