Carrier 58DE - Manual (Page 5)

TABLE V-TROUBLE ANALYSIS CHART
7 ^ Off 98« ptmer supply to o»it before searyioli^
<«stless 4 S|» 8 <^^te 8 t reooires 9ds and electrtc supji^ies^.
SYMPTOM CAUSE REMEDY
Pilot will not light
No spark at electrode
Readjust, if necessary, so that + 0 025
gap between electrode tip and pilot burner is 1/8 - 0 005 inch
Clean dirt or moisture accumulation from electrode ceramic with cloth.
Cracked ceramic—replace pilot electrode assy.
Check for loose or broken wiring at and between spark generator and
electrode. Replace wire or tighten connection as necessary.
Check fuse or circuit breaker for 115-volt supply to furnace.
Check 24-volt input to spark generator If you read 24 volts and above
steps have been completed, replace spark generator assy.
Spark shorting out to main burner Readjust electrode as specified.
No gas at pilot burner
Clean pilot orifice.
Check for proper opening of pilot valve, broken wires, or loose
connections. If no deficiency is found, replace valve assy.
Burners will not ignite.
No 115-volt power to furnace Connect to power supply. Check fuse, wiring, or circuit breaker.
No 24-volt power to control circuit Replace transformer.
Miswired or loose connections Check all wiring and all wirenut connections.
No gas at main burners Check voltage to teiminals 1 and 2 of gas valve.
Check for proper opening of main gas valve, broken wires, or loose
connections. If no deficiency is found, replace gas valve assy.
Flame probe or connecting lead is
shorted or open.
Correct electrical shorting or open circuit
Dirty pilot—yellow flame Clean pilot orifice.
Inadequate heating
Manual reset limit switch contacts open
Faulty fan switch—replace Combination of incorrect
fan switch setting and dirty filters—reset fan switch and
clean or replace filters.
Furnace undersized for application Replace with proper size furnace.
Gas input to furnace too low
Check gas pressure at manifold Clock gas meter for
input If too low, increase manifold pressure, or install
correct orifices.
Limit switch cycles main burners
Clean dirty air filters—reinstall.
Increase blower speed.
Lower OFF setting of fan control.
Open registers—ductwork restricted.
Check anticipator setting on thermostat.
Aldehyde odors, (CO),
sooting flame-
floating flame
Incomplete combustion —
poor flame characteristics
Adjust air shutter on burners to provide soft, blue flame Check all
screws around flue outlets and burner compartment. Tighten.
See "Section II, Location & Air for Combustion & Ventilation" (Std
Procedures for Gas-Fired Furnaces).
Replace cracked heaf exchanger.
Reduce input and check orifices—furnace overfired.
Check vent for restriction.
#
For replacement items use Carrier Specified Parts.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Tab 10 Form 58DE-1 SI New Printed in U S A 10-77 PC 101 Catalog No 535—831
Book 1 4
Tab 6a 8a