PROBLEM
PROBABLE CAUSE
Pilot Will Not Light
1. Manual valve turned off
1 Open valve
(Match Lit System)
2. Air in gas line
2 Disconnect pilot line at shut off bleed air from gas
supply line
3. Incorrect lighting procedure 3 Follow instructions on cover of junction box.
4. Dirt in pilot orifice
4 Remove orifice. Clean with compressed air or solvent
(do not ream)
5. Extremely high or low gas
5 Check line pressure, this should be 3 oz or 5 in. water
pressure
pressure minimum. 8 oz or 14 in. maximum
6. Bent or kinked pilot tubing
6 Replace tubing
Pilot Lighted But Magnetic 1. Power not turned on or
1 Turn on power, check fuses, turn on thermostat
Gas Valve Will Not Open thermostat not calling for
(All Manual Valves Are
heat.
Open) (Match Lit System) 2. Circuit to magnetic valve
2 Check wiring and connections at transformer and
open
thermostat
3. Faulty transformer
3 Replace transformer
4. Faulty or dirty thermocouple 4 Clean and test with millivolt meter or test kit. Replace
or safety pilot switch
defective part.
5. Faulty thermostat
5 Replace thermostat
6. Faulty magnetic valve
6 Replace valve or magnetic head
7. High gas pressure
7 Max. gas pressure 8 oz or 14" W.C.
Venter Motor Will Not
1. No power to unit
1 Turn on power, check supply fuses or circuit breaker
Start (RPV Models)
2. No 24 volt power to venter
2 Turn up thermostat, check control transformer output
relay
Check for loose or improper wire connections
3. Venter relay defective
3 Replace
4. Defective motor or capacitor 4 Replace motor or capacitor
Pilot Will Not Light
1. Manual valve not open
1 Open manual valve
(Spark Ignition System)
2. Air in gas line
2 Bleed gas line
(Venter Operation on RPV 3. Dirt in Pilot Orifice
3 Remove and clean with air pressure
Models)
4. Gas pressure too high or
4 Set supply pressure at 5" to 8" for natural gas - 11"
too low
for propane
5. Kinked pilot tubing
5 Replace tubing
6. Pilot valve does not open
6 If 24V available at valve, replace valve
7. No Spark:
7
a. Loose wire connection
a. Be certain all wire connections are solid
b. Transformer failure
b. Be certain 24 volts is available
c. Incorrect spark gap.
c. Maintain spark gap 7/64"
Pilot Will Not Light Con't
d. Spark cable shorted to
d. Replace worn or grounded spark cable
SOLUTION
TROUBLE SHOOTING GUIDES
Gas Furnace by Reznor
