Bryant R-410A 583B Installation And Operating Instructions Manual page 27

SYMPTOM
Burners will not ignite.
Inadequate heating.
Poor flame. characteristics
TABLE 11—TROUBLESHOOTING — HEATING
CAUSE
Water in gas line
No power to furnace
Miswired or loose connections
Burned-out heat anticipator in thermostat
Broken thermostat wire
Misaligned spark electrodes
No gas at main burners
Dirty air filter
Gas input to furnace too low
Unit undersized for application
Restricted airflow
Blower speed too low
Limit switch cycles main burners
Incomplete combustion results in: Aldehyde odors, car-
bon monoxide, sooting flame, floating flame
Check power supply fuses, wiring, or circuit breaker.
Check all wiring and wirenut connections.
Run continuity check. Replace wire if necessary.
Check flame ignition and sense electrode positioning.
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 before attempting to light unit.
check gas pressure at manifold. Match with that on unit
Replace with proper unit or add additional unit.
Clean or replace filter. Remove any restriction.
Use faster speed tap if available, or install alternate
Check rotation of blower, thermostat heat anticipator
settings, and temperature rise of unit. Adjust as neces-
1. Tighten all screws around burner compartments.
3. Unit overfired. Reduce input (change orifices or ad-
—27—
REMEDY
Drain. Install drip leg.
Replace thermostat.
Adjust as necessary
2. Check gas valve.
Clean or replace filter as necessary.
nameplate.
motor.
sary.
2. Cracked heat exchanger. Replace
just gas line or manifold pressure).
4. Check burner alignment.