CostolioCarrier 58MVP, 58MVB, 58UVB variable-speed condensing gas furnaces error codes
16 furnace error codes for Carrier 58MVP, 58MVB, 58UVB variable-speed condensing gas furnaces, what each one means and what to try, paraphrased from Carrier's own source. Codes vary by model, so confirm in your own manual.
Safety. The guide says only trained, qualified personnel should repair or service gas and electrical parts of the furnace. Source: 58MVP Series 170 & 180, 58MVB, 58UVB Troubleshooting Guide (Carrier).
All codes
- Rapid flashing Line voltage (115 VAC) polarity reversed.
- 13 Limit circuit lockout.
- 14 Ignition lockout; the control resets itself after 3 hours.
- 15 Blower motor lockout: the blower failed to reach 250 RPM or failed to communicate in two successive heating cycles.
- 21 Gas heating lockout; will not reset itself.
- 22 Abnormal flame-proving signal: flame is proved while the gas valve is de-energized.
- 23 Pressure switch did not open.
- 24 Low-voltage (24 VAC) fuse is open.
- 31 High-heat pressure switch or relay did not close, or reopened.
- 32 Low-heat pressure switch did not close, or reopened.
- 33 Limit circuit fault: limit or rollout switch is open.
- 34 Ignition proving failure.
- 41 Blower motor fault.
- 42 Inducer motor fault.
- 43 Low-heat pressure switch open while high-heat switch is closed.
- 45 Control circuitry lockout; resets after 1 hour.
Rapid flashing
What it means: Line voltage (115 VAC) polarity reversed. This one often needs a licensed technician.
What to try
- Have a qualified technician check the line voltage polarity.
13
What it means: Limit circuit lockout. This one often needs a licensed technician.
What to try
- Have a technician check the limit and rollout switches.
14
What it means: Ignition lockout; the control resets itself after 3 hours. This one often needs a licensed technician.
What to try
- Refer to status code 34; have a technician check it.
15
What it means: Blower motor lockout: the blower failed to reach 250 RPM or failed to communicate in two successive heating cycles. This one often needs a licensed technician.
What to try
- Have a technician check the blower motor (refer to status code 41).
21
What it means: Gas heating lockout; will not reset itself. This one often needs a licensed technician.
What to try
- A technician checks for a mis-wired gas valve or bad control relay.
22
What it means: Abnormal flame-proving signal: flame is proved while the gas valve is de-energized. This one often needs a licensed technician.
What to try
- A technician checks for a leaky or stuck-open gas valve.
23
What it means: Pressure switch did not open. This one often needs a licensed technician.
What to try
- A technician checks the pressure switch.
24
What it means: Low-voltage (24 VAC) fuse is open. This one often needs a licensed technician.
What to try
- Have a technician check for a short circuit in the secondary voltage (24 VAC) wiring.
31
What it means: High-heat pressure switch or relay did not close, or reopened. This one often needs a licensed technician.
What to try
- A technician checks the switch, relay and gas valve wiring.
32
What it means: Low-heat pressure switch did not close, or reopened. This one often needs a licensed technician.
What to try
- A technician checks venting, gas pressure and switches.
33
What it means: Limit circuit fault: limit or rollout switch is open. This one often needs a licensed technician.
What to try
- Have a technician check the limit and rollout switches.
34
What it means: Ignition proving failure. This one often needs a licensed technician.
What to try
- Make sure the gas is on.
- A technician checks gas pressure, igniter, grounding and cleans the flame sensor.
41
What it means: Blower motor fault. This one often needs a licensed technician.
What to try
- Have a technician check the blower.
42
What it means: Inducer motor fault. This one often needs a licensed technician.
What to try
- A technician checks venting, combustion air and the inducer motor.
43
What it means: Low-heat pressure switch open while high-heat switch is closed. This one often needs a licensed technician.
What to try
- Check the condensate drain; a technician checks venting and switches.
45
What it means: Control circuitry lockout; resets after 1 hour. This one often needs a licensed technician.
What to try
- Reset power to clear the lockout.
- Have a technician replace the control if the status code repeats.
Source
- 58MVP Series 170 & 180, 58MVB, 58UVB Troubleshooting Guide (Carrier) (checked 2026-11-02)
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