Carrier WEATHERMAKER 48J Started Manual page 80

Table 95 -- Gas Heating Service Analysis
PROBLEM CAUSE REMEDY
Burners Will Not Ignite. Active alarm. Check active alarms using ComfortLink
TM
scrolling
marquee.
No power to unit. Check power supply, fuses, wiring, and circuit breakers.
No power to IGC (Integrated Gas Control). Check fuses and plugs.
Heaters off due to time guard to prevent short Check using ComfortLink scrolling marquee.
cycling.
Control calling for Cooling.
No gas at main burners.
Water in gas line.
Inadequate Heating. Dirty air filters.
Gas input too low.
Control calling for Wlonly (low heat).
Unit undersized for load.
Restricted airflow.
Too much outdoor air.
Limit switch cycles main burners.
Poor Flame Characteristics.
Incomplete combustion (lack of combustion air)
results in: Aldehyde odors, CO, sooting flame, or
floating flame.
Burners Will Not Turn Off. Unit is in minimum on-time.
Unit running in Service Test mode.
Check using ComfortLink scrolling marquee.
Check gas line for air and purge as necessary. After purg-
ing gas line of air, allow gas to dissipate for at least 5 min-
utes before attempting to re-light unit.
Drain water and install drip.
Replace air filters.
Check gas pressure at manifold. Refer to gas valve adjust-
ment in Installation, Start-up, and Service Manual.
Allow time for W2 to energize.
Decrease load.
Remove restriction.
Check economizer position and configuration. Adjust mini-
mum position using ComfortLink scrolling marquee.
Check rotation of blower, thermostat heat anticipator set-
tings, and temperature rise of unit. Adjust as needed.
Check all screws around flue outlets and burner compart-
ment. Tighten as necessary.
Cracked heat exchanger, replace.
Unit is over-fired, reduce input. Adjust gas line or manifold
)ressure.
Check vent for restriction. Clean as necessary.
Check orifice to burner alignment.
Check using ComfortLink scrolling marquee.
Check using ComfortLink scrolling marquee.
Table 96 -- Electric Heat Service Analysis
PROBLEM CAUSE REMEDY
No Heat. Power failure. Call power company.
Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker.
Thermostat occupancy schedule set point not call- Check using ComfortLink scrolling marquee.
ing for Heating.
No 24 vac at primary contactor. Check transformer and circuit breaker.
No power (high voltage) to L2 of primary contactor. Check safety switches "one-shot" backup and auto limit.
Bad electrical elements. Power off unit and remove high voltage wires. Check resis-
tance of heater, replace if open.
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