Carrier 58TMA Service And Maintenance Instructions page 9

Service should be performed only by qualified persons.
If status code recall is needed, do not remove power or blower door.
LED CODE
CONTINUOUS OFF Check for 115V at L1 and L2, and 24V at SEC1 and SEC2.
CONTINUOUS ON Control has 24V power.
RAPID FLASHING Line voltage polarity reversed. If twinned, 24V power
to one furnace may be out of phase with power to other furnace.
EACH OF THE FOLLOWING STATUS CODES IS A TWO-DIGIT NUMBER WITH
THE FIRST DIGIT DETERMINED BY THE NUMBER OF SHORT FLASHES AND
THE SECOND DIGIT BY THE NUMBER OF LONG FLASHES.
11 NO PREVIOUS CODE - Stored status codes are erased when power (115V or
24V) to control is interrupted or 48 hours after each fault is cleared.
12 BLOWER ON AFTER POWER UP - Blower runs for 90 seconds, if unit is
powered up during a call for heat (R-W/W1 closed). Note: 2-sec. ON-delay.
13 LIMIT OR FLAME ROLL-OUT (FRS) SWITCH LOCKOUT - Auto-reset after
three hours. FRS switch requires manual-reset.
Check for: - Refer to #33
14 IGNITION LOCKOUT - Control will auto-reset after three hours. Refer to #34.
21 GAS HEATING LOCKOUT - Control will NOT auto-reset.
Check for: - Mis-wired gas valve
22 ABNORMAL FLAME-PROVING SIGNAL - Flame is proved while gas valve is
de-energized. Inducer will run until fault is cleared.
Check for: - Leaky gas valve
23 LOW- OR HIGH-HEAT PRESSURE SWITCH DID NOT OPEN
Check for: - Obstructed pressure tubing
- Defective pressure switch (stuck closed)
24 SECONDARY VOLTAGE FUSE IS OPEN
Check for: - Short-circuit in secondary voltage (24V) wiring
31 HIGH-HEAT PRESSURE SWITCH OR RELAY DID NOT CLOSE OR
REOPENED
Check for: -Control relay may be defective
32 LOW-HEAT PRESSURE, DRAFT SAFEGUARD , OR AUX-LIMIT
(DOWNFLOW ONLY*) SWITCH DID NOT CLOSE OR REOPENED
Check for: - Proper vent sizing (and condensate pitch with side-wall vent)
- Low inducer voltage (115v)
- Defective inducer motor
- Excessive wind
- Inadequate combustion air supply
- Disconnected or obstructed pressure tubing
33 LIMIT OR FLAME ROLL-OUT (FRS) SWITCH IS OPEN - FRS switch
requires manual-reset.
Check for: - Inadequate combustion air supply (FRS switch only)
- Dirty filter or restricted duct system
- Defective switch or connections
- Blower motor or capacitor failure
34 IGNITION-PROVING FAULT - Control will retry three times before lockout #14.
Check for: - Oxide buildup on flame-proving sensor (clean with fine sandpaper).
- Proper flame-proving microamps (0.5 minimum)
- Proper control ground continuity
- Flame-proving sensor must be ungrounded
- Smooth flame carryover and ignition
43 LOW-HEAT PRESSURE, DRAFT SAFEGUARD, OR AUXILIARY LIMIT
SWITCH OPEN WHILE HIGH-HEAT PRESSURE SWITCH IS CLOSED
Check for: - Disconnected or obstructed pressure tubing
- Defective pressure switch (stuck open)
- Refer to #32 and #33
45 REPLACE CONTROL
Fig. 13—Service Label
WARNING
SERVICE
STATUS
- Defective control (valve relay)
- Stuck-open gas valve
- Refer to #32
* Blower motor and capacitor
- Defective pressure switch
- Restricted vent
- Loose blower wheel
- Manual valve(s) OFF
9
320893-101 REV. A
A94169