HeatingCodes

Carrier furnace status code 32: low-heat pressure switch did not close or reopened

By Jason Dearmin · Last reviewed November 14, 2026 · How we check facts

Short answerCode 32 means the low-heat pressure switch did not close or reopened, so the control does not see proof of draft from the inducer. Carrier's list of causes starts with excessive wind, a restricted vent, a defective inducer motor and obstructed or disconnected pressure tubing.

What code 32 means

Carrier's definition: Low-heat pressure switch did not close or reopened. The pressure switch is a safety device that proves the inducer is pulling combustion gases through the heat exchanger and out the vent. If it will not close, the control will not light the burners.

Carrier adds that if the switch stays open longer than five minutes, the inducer shuts off for 15 minutes before the control tries again. If it opens during the blower on-delay period, the blower comes on for the selected blower-off delay. So a furnace with this code can sit silent for a quarter hour and then try again.

Carrier's list of causes

Why winter makes this code more common

Goodman's service manual for its 96% condensing furnaces explains that the pressure switches monitor airflow through the heat exchanger and also guard against "blocked condensate drain conditions." A condensing furnace produces water, and a drain that is clogged or frozen can keep a pressure switch from closing. Snow, ice or debris at the outdoor vent and intake terminations are classic examples of a restricted vent. Neither source gives a winter-specific table, so treat this as a practical reading of their lists, not a manufacturer claim.

What a homeowner can safely do

Look from the ground at the outdoor vent and intake pipe ends and clear obvious snow, ice or leaves. Keep the area around the termination clear. Everything else on the list (tubing, switch, inducer, voltage, gas pressure) needs a technician.

Never bypass the pressure switch Jumpering a pressure switch removes proof that exhaust gases are leaving the house. That can lead to carbon monoxide in the home.

Safe homeowner checks for Carrier code 32

  1. Look at the outside terminationsFrom the ground, check the furnace vent and combustion-air pipe ends for snow, ice, leaves or nests and clear what you can reach safely.
  2. Wait out the retry windowIf the inducer shut off after five minutes, Carrier says it waits 15 minutes before retrying. Give it that time before concluding the furnace is dead.
  3. Call a technician if it repeatsIf code 32 returns after the vent is clear, a technician should check the pressure tubing, switch, inducer and condensate drain.

Frequently asked questions

Is code 32 the same as a Trane 3-flash code?

They describe a similar condition. Trane's 3-flash code on its Integrated Furnace Control is a draft pressure error (venting, pressure switch or inducer problem). Different brands use different boards, so match the code to your own furnace's label.

What is the difference between 31, 32 and 43?

Carrier lists 31 for the high-heat pressure switch or relay, 32 for the low-heat pressure switch, and 43 for the low-heat pressure switch being open while the high-heat switch is closed (often tubing or wiring).

Sources

Related

Trane furnace blinking 3 timesCarrier furnace status code 33How to read your furnace blinking light code

Safety note: this page is general information drawn from the sources above. Gas, combustion and line-voltage repairs belong to a licensed professional. Your own equipment's label and manual take priority over anything here. Read the full disclaimer.