Reznor BE Unit Installation Manual - Manual (Page 28)

Form RZ-NA-I-FE/BE, Mfg P/N 98807 Rev 10, Page 27
43. Troubleshooting
TRO UBLE PRO BABLE C AUSE REMEDY
Ve nte r motor will
not start 1. No power to unit. 1. T urn on power, check supply fuses, or circuit breaker. If unit is equipped with
unit-mounted disconnect switch, check circuit breaker (See Paragraph 12).
2. No 24 volt power to venter relay. 2. T urn up thermostat; check control transformer output.
3. Venter relay defective. 3. Replace relay.
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 2. Air in gas line. 2. Bleed gas line.
syste m) 3. Dirt in pilot orifice. 3. Remove and clean with compressed air or solvent (do not ream).
4. Gas pressure too high or too low. 4. Supply pressure should be 5-14"w.c. for natural gas or 10-14" w.c. for propane
gas. (See Paragraph 11.)
5. Kinked pilot tubing. 5. Replace tubing.
6. Pilot valve does not open. 6. If 24 volt available at valve, replace valve.
7. No spark: 7.
a) Loose wire connections a) Be certain all wires connections are solid.
b) T ransformer failure. b) Be certain 24 volts is available.
c) Incorrect spark gap. c) Maintain spark gap at .100".
d) Spark cable shorted to ground. d) Replace worn or grounded spark cable.
e ) Spark electrode shorted to ground. e ) Replace pilot if ceramic spark electrode is cracked or grounded.
f) Drafts affecting pilot. f) Make sure all panels are in place and tightly secured to prevent drafts at pilot.
g) Ignition control not grounded. g) Make certain ignition control is grounded to furnace chassis
h) Faulty ignition controller. h) If 24 volt is available to ignition controller and all other causes have been
eliminated, replace ignition control.
8. Optional lockout device interrupting control
circuit by above causes. 8. Reset lockout by interrupting control at thermostat.
9. Faulty combustion air proving switch. 9. Replace combustion air proving switch.
Pilot lights, main 1. Manual valve not open. 1. Open manual valve.
valve will not ope n 2. Main valve not operating. 2.
(Spark Ignition
syste m) a) Defective valve. a) If 24 volt is measured at valve connections and valve remains closed, replace
valve.
b) Loose wire connections. b) Check and tighten all wiring connections.
3. Ignition control does not power main valve. 3.
a) Loose wire connections. a) Check and tighten all wiring connections.
b) Flame sensor grounded. (Pilot lights - spark
continues) b) Be certain flame sensor lead is not grounded or insulation or ceramic is not
cracked. Replace as required.
c) Gas pressure incorrect. c) Supply pressure should be 5-14"w.c. for natural gas or 10-14" w.c. for propane
gas. (See Paragraph 11.)
d) Cracked ceramic at sensor. d) Replace sensor.
e ) Faulty ignition controller. e ) See Paragraph 34. If all checks indicate no other cause, replace ignition
controller. DO NOT AT T EMPT T O REPAIR IGNIT ION CONT ROLLER. T HIS
DEVICE HAS NO FIELD REPLACEABLE PART S.
No he at (He ate r 1. Incorrect manifold pressure or orifices. 1. Check manifold pressure (See Paragraph 16).
O pe rating) 2. Cycling on limit control. 2. Check air throughput (See Paragraph 16).
3. Improper thermostat location or adjustment. 3. See thermostat manufacturer's instructions.
C old air de live re d 1. Fan control improperly wired 1. Connect as per wiring diagram.
O n Start-up 2. Defective fan control. 2. Replace fan control.
During O pe ration 3. Incorrect manifold pressure. 3. Check manifold line pressure (See Paragraph 11).
Motor will not run 1. Circuit open. 1. Check wiring and connections. .
2. Fan control inoperative. 2. Replace fan control.
3. Defective motor or capacitor. 3. Replace motor or capacitor.
Motor turns on 1. Fan control improperly wired. 1. Connect as per wiring diagram.
and off while 2. Defective fan control. 2. Replace fan control.
burne r is ope rating
(Se e motor cuts out 3. Poor contact between fan control and heat
exchanger tube. Surface contact is required. 3. Check for bent mounting or loose mounting screws.
on ove rload 4. Motor overload device cycling on and off. 4. Check motor load against motor rating plate. Replace motor if needed.
be low) 5. Low ambient temperature (less than 40°F)
causing false cycling. 5. Install fan delay relay kit (See Paragraph 18.)
Fan motor cuts 1. Low or high voltage supply . 1. Correct electric supply.
out on ove rload 2. Defective motor. 2. Replace motor.
3. Poor air flow. 3. Clean motor, fan and fan guard.
4. Defective bearing or lubrication. 4. Lubricate bearings or replace motor.
Blowe r motor 1. Improper motor pulley and/or adjustment. 1. See instructions in Paragraph 15.
cuts out on 2. Improper static pressure in the duct system. 2. Adjust duct system dampers.
ove rload 3. Low voltage. 3. Check power supply.