CODE 32
Fraser-Johnston
Low Heat Pressure Switch Fault
LED flashes three short and two long blinks; furnace cycles on and off frequently; may not reach set temperature.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Marginal venting, Undersized intake pipe, Weak inducer motor, Incorrect pressure switch setting
How to Fix / Troubleshooting
Safety first: Turn off power before disconnecting tubing or wiring.
- Inspect vent and intake sizing: Compare installed vent and intake pipe diameters and lengths to the Fraser‑Johnston installation manual. Excessive length or too many elbows can cause low draft.
- Check for partial blockages: Look for sagging pipes with water accumulation, or debris at terminations.
- Clean condensate system: Flush the condensate trap and hoses to ensure free drainage.
- Have a technician verify: A professional can measure draft pressure and confirm whether the pressure switch and inducer are operating within specifications.
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Repair Difficulty
Professional Required
5/5
Required Part
Pressure Switch
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