Ducane CMP A Series Installation Instructions Manual page 18

"TROUBLE SHOOTING" GUIDE FOR GAS-FIRED FURNACES
WITH SmartValve
TM
AND HSI PILOT
Table 1.18
TROUBLE ANALYSIS CHART
SYMPTOM
Pilot will not light.
Burners will not ignite.
inadequate heating.
_ddehyde odors, (CO),
_oofing
flame, floating flame.
PROBABLE CAUSE
No pilot flame
Problem with SV9501 control/valve.
No 115 volt power to fumace.
No 24 volt power to control circuit.
Miswired or loose connections.
No gas at main burners.
Flame rollout, blocked vent shutoff, or
blocked drain safety switches open
(activated).
Problem with SV9501 control/valve.
Furnace undersized for application.
_qasinput to furnace too low.
Limit switch cycles main burners.
Furnace cycles too often.
[ncomplete combustion - poor flame
haracteristics.
ACTION
Check to see if main valve is turned "ON''.
Check pilot H,S.I for breakage.
Check pilot orifice for blockage.
See Figure 1.19 (SmartValve ru Trouble Shooting Guide).
Connect to power supply. Check fuse, wiring, or circuit breaker.
Check transformer - replace.
Check fuse on fan timer board - replace.
Check all wiring and wiring connections.
Check to see if main valve is opening or turned "ON".
Look for loose or broken wiring connections. If no deficiency is
found, replace valve assembly.
Check heat exchanger, venting system and condensate removal
tubing for blockage.
See Figure 1.19 (SmartValve ra Trouble Shooting Guide).
Replace with proper size furnace.
Check gas pressure at manifold. Clock gas meter for input. If too
low, increase manifold pressure, or replace with correct orifices.
Dirty air filters - clean and reinstall.
Blower speed too low - use faster speed tap.
Registers closed, restricted ductwork - open or remove restriction.
Check heat anticipator setting on thermostat - readjust.
Check all screws around flue outlets and burner compartment-
tighten.
LACK OF COMBUSTION AIR - see instructions.
Cracked heat exchanger - replace.
Overtired furnace - reduce input or change orifices.
Check vent for restriction - clean as required.
20246506 Issue 9939 Page 18 of 22