R
OBER
TS
-
GORDON
SECTION
12:
TR
OUBLESHOO
TING
pg 39
Contact
ROBERTS GORDON
®
at www. rg-inc.com
Replace
sensor.
Is the sensor
dirty?
YES
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?
TROUBLESHOOT ENDS
If the problem persists, contact your
ROBERTS GORDON
®
Independent Distributor.
Were the gas lines
purged of air?
Check inlet gas pressure during ignition period.
Is the natural gas pressure 4.6 W.C.?
5.0 for model CTH2-175 (LP pressure 110. W.C.?)
* 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.
SmartValve
®
II ignition system
control switch must be in the
on position, 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 Figure 34.
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 sensor
lead OK?
Replace wires.
Is the sensor
positioned
properly?
YES
YES
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
Clean
sensor.
NO
5*
4*
3*
3*
The SmartValve
®
II checks the status of the blower pressure switch contacts and must
see a change in the contact with every firing cycle. Placing a jumper at the pressure
switch out of sequence will result in a fault with the LED indicator flashing two times.
4*
A fault indication of six flashes may indicate that the
flame sensing circuit is not functioning properly. Perform
the following series of checks to rectify the problem.
5*
In normal operation, the LED indicator will be
flashing bright to dim continuously.