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Table 15 – Troubleshooting Guide–Heating
SYMPTOM
CAUSE
REMEDY
Burners will not ignite
Water in gas line
Drain. Install drip leg.
No power to furnace
Check power supply fuses, wiring or circuit breaker.
No 24--v power supply to control circuit
Check transformer.
NOTE: Some transformers have internal over--current protection
that requires a cool--down period to reset.
Mis--wired or loose connections
Check all wiring and wire nut connections
Misaligned spark electrodes
Check flame ignition and sense electrode positioning.
Adjust as necessary.
No gas at main burners
1. Check gas line for air. Purge as necessary. NOTE: After purging
gas line of air, wait at least 5 minutes for any gas to dissipate be-
fore attempting to light unit.
2. Check gas valve.
Inadequate heating
Dirty air filter
Clean or replace filter as necessary
Gas input to furnace too low
Check gas pressure at manifold match with that on unit nameplate
Unit undersized for application
Replace with proper unit or add additional unit
Restricted airflow
Clean or replace filter. Remove any restriction.
Limit switch cycles main burners
Check rotation of blower, temperature rise of unit. Adjust as neces-
sary.
Poor flame characteristics
Incomplete combustion results in: Aldehyde odors,
carbon monoxide, sooting flame, floating flame
1. Tighten all screws around burner compartment
2. Cracked heat exchanger. Replace.
3. Unit over--fired. Reduce input (change orifices or adjust gas line
or manifold pressure).
4. Check burner alignment.
5. Inspect heat exchanger for blockage. Clean as necessary.
Table 16 – Troubleshooting Guide–LED Status Codes
SYMPTOM
CAUSE
REMEDY
No Power or Hardware fail-
ure
(LED OFF)
Loss of power to control module (IGC)*.
Check 5--amp fuse son IGC*, power to unit, 24--v circuit breaker,
and transformer. Units without a 24--v circuit breaker have an
internal overload in the 24--v transformer. If the overload trips,
allow 10 minutes for automatic reset.
Limit switch faults
(LED 2 flashes)
High temperature limit switch is open.
Check the operation of the indoor (evaporator) fan motor. Ensure
that the supply--air temperature rise is in accordance with the
range on the unit nameplate. Clean or replace filters.
Flame sense fault
(LED 3 flashes)
The IGC* sensed flame that should not be present.
Reset unit. If problem persists, replace control board.
4 consecutive limit switch
faults
(LED 4 flashes)
Inadequate airflow to unit.
Check the operation of the indoor (evaporator) fan motor and that
supply--air temperature rise agrees with range on unit nameplate
information.
Ignition lockout fault
(LED 5 flashes)
Unit unsuccessfully attempted ignition for 15 minutes.
Check ignitor and flame sensor electrode spacing, gaps, etc.
Ensure that fame sense and ignition wires are properly terminated.
Verify that unit is obtaining proper amount of gas.
Pressure Switch fault
(LED 6 flashes)
Open pressure switch.
Verify wiring connections to pressure switch and inducer motor.
Verify pressure switch hose is tightly connected to both inducer
housing and pressure switch. Verify inducer wheel is properly
attached to inducer motor shaft. Verify inducer motor shaft is turn-
ing.
Rollout switch fault
(LED 7 flashes)
Rollout switch has opened.
Rollout switch will automatically reset, but IGC* will continue to
lockout unit. Check gas valve operation. Ensure that induced--draft
blower wheel is properly secured to motor shaft. Inspect heat
exchanger. Reset unit at unit disconnect.
Internal control fault
(LED 8 flashes)
Microprocessor has sensed an error in the software
or hardware.
If error code is not cleared by resetting unit power, replace the
IGC*.
Temporary 1 hr auto reset
1
(LED 9 flashes)
Electrical interference impeding IGC software
Reset 24--v. to control board or turn thermostat off, then on again.
Fault will automatically reset itself in one (1) hour.
*
WARNING
:
If the IGC must be replaced, be sure to ground yourself to dissipate any electrical charge that my be present before handling new control
board. The IGC is sensitive to static electricity and my be damaged if the necessary precautions are not taken.
IMPORTANT
: Refer to Table 15---Troubleshooting Guide---Heating for additional troubleshooting analysis.
LEGEND
IGC—Integrated Gas Unit Controller
LED—Light---Emitting Diode
48V
R
--
A
Summary of Contents for Performance 15 48VR-A
Page 5: ...5 A13167 Fig 3 48VR A24 30 Unit Dimensions 48VR A ...
Page 6: ...6 A13168 Fig 4 48VR A36 60 Unit Dimensions 48VR A ...
Page 19: ...19 A13153 Fig 14 208 230 1 60 Connection Wiring Diagram Gas Inputs 40 60 90 KBtu hr 48VR A ...
Page 20: ...20 A13154 Fig 15 Cont 208 230 1 60 Ladder Wiring Diagram Gas Inputs 40 60 90 KBtu hr 48VR A ...
Page 21: ...21 A13155 Fig 15 208 230 1 60 Connection Wiring Diagram Gas Inputs 115 130 KBtu hr 48VR A ...
Page 22: ...22 A13156 Fig 16 Cont 208 230 1 60 Ladder Wiring Diagram Gas Inputs 115 130 KBtu hr 48VR A ...
Page 23: ...23 A13157 Fig 16 208 230 3 60 Connection Wiring Diagram Gas Inputs 40 60 90 KBtu hr 48VR A ...
Page 24: ...24 A13158 Fig 17 Cont 208 230 3 60 Ladder Wiring Diagram Gas Inputs 40 60 90 KBtu hr 48VR A ...
Page 25: ...25 A13159 Fig 17 208 230 3 60 Connection Wiring Diagram Gas Inputs 115 130 48VR A ...
Page 26: ...26 A13160 Fig 18 Cont 208 230 3 60 Ladder Wiring Diagram Gas Inputs 115 130 48VR A ...