Low-heat pressure switch did not close, or it reopened. If it stays open longer than five minutes, the inducer shuts off for 15 minutes before a retry. If it opens during the blower on-delay, the blower comes on for the selected blower off-delay.
Homeowner part this code names: furnace pressure switch hose.
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Bryant furnace 32 is the low-heat pressure switch that did not close or that reopened. If it stays open longer than five minutes, the inducer shuts off for 15 minutes before a retry. If it opens during the blower on-delay, the blower runs the selected off-delay. The chart lists vent sizing, a restricted vent, the inducer, 115 V to the inducer, the switch, low inlet gas pressure if an LGPS is used, wind, combustion air, and the pressure tubing. Code 23 is the switch that did not open. Code 31 is the high-heat switch.
Same characters, different appliance: Bryant 32 on an AC / heat pump is a different fault. Bryant AC / heat pump 32.
Likely causes
- Vent sizing is wrong, or the vent is restricted
- Defective inducer motor or a low 115 V supply to the inducer
- Defective pressure switch
- Low inlet gas pressure, if a low-gas-pressure switch is used
- Excessive wind or inadequate combustion air
- Disconnected or obstructed pressure tubing
Safe checks for 32
- Look at the outdoor intake and exhaust terminations for snow, ice, leaves, or a nest. Leave the pipes connected
- Count 3 short flashes and 2 long flashes before you cut power. A 15-minute inducer pause is the control waiting, not a repair
- Techniciancheck vent sizing, the inducer and its 115 V supply, the pressure switch, inlet gas pressure if an LGPS is used, and the pressure tubing
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
Call a licensed HVAC technician if the terminations are clear and 32 returns. Never jumper a pressure switch.
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Parts & tools for this fix
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Furnace pressure switch hose: guide
In this code: Disconnected or obstructed pressure tubing
See the guide for what to look for when buying one.
Furnace pressure switch: guide
In this code: Defective pressure switch
This one is for a technician to test or replace, so we only explain it and do not link to buy it.
Furnace inducer (draft) motor: guide
In this code: Defective inducer motor or a low 115 V supply to the inducer
This one is for a technician to test or replace, so we only explain it and do not link to buy it.