Carrier 48TJD008-014 User Manual download pdf (Page 31)

TROUBLESHOOTING

Table 17 — LED Error Code Service Analysis

PROBLEM CAUSE REMEDY

Hardware failure.

(LED OFF)

Loss of power to control module (IGC). Check 5-amp fuse on 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 trans-

former. If the overload trips, allow 10 minutes for auto-

matic reset.

Limit switch fault.

(LED 2 ﬂashes)

High temperature limit switch is open. Check the operation of the indoor (evaporator) fan mo-

tor. Ensure that the supply-air temperature rise is in ac-

cordance with the range on the unit nameplate.

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 trips.

(LED 4 ﬂashes)

Inadequate airﬂow to unit. Check operation of indoor (evaporator) fan motor and

that supply-air temperature rise agrees with range on

unit nameplate information.

Ignition lockout.

(LED 5 ﬂashes)

Unit unsuccessfully attempted ignition for 15 minutes. Check ignitor and ﬂame sensor electrode spacing, gaps,

etc. Ensure that ﬂame sense and ignition wires are prop-

erly terminated. Verify that unit is obtaining proper

amount of gas.

Induced-draft motor

fault.

(LED 6 ﬂashes)

IGC does not sense that induced-draft motor is

operating.

Check for proper voltage. If motor is operating, check

the speed sensor plug/IGC Terminal J2 connection.

Proper connection: PIN 1 — White, PIN 2 — Red, PIN 3

— Black.

Rollout switch fault.

(LED 7 ﬂashes)

Rollout switch has opened. Rollout switch will automatically reset, but IGC will con-

tinue to lock out unit. Check gas valve operation. Ensure

that induced-draft blower wheel is properly secured to

motor shaft. 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, re-

place the IGC.

LEGEND

IGC — Integrated Gas Unit Controller

LED — Light-Emitting Diode

If the IGC must be replaced, be sure to ground yourself to dis-

sipate any electrical charge that may be present before han-

dling new control board. The IGC is sensitive to static electricity

and may be damaged if the necessary precautions are not taken.

IMPORTANT: Refer to Table 21 — Heating Service Troubleshoot-

ing for additional troubleshooting information.

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Carrier 48TJD008-014 User Manual Page 31

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