Raypak Error Lo Water Cutoff Err: Low Water Cut-Off
The low water cut-off safety detected that the boiler is not full of water, so it shuts down the burner. The display prompts to purge air, check the pump, and check the isolation valve. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
The low water cut-off safety detected that the boiler is not full of water, so it shuts down the burner. The display prompts to purge air, check the pump, and check the isolation valve.
Raypak fault codes can vary by model and series. Use this as a guide — the same code can have more than one cause. Our Technical Safety BC–licensed technicians read the code, confirm it against your unit's manual, and diagnose the true cause before any repair.
Likely causes of Raypak error Lo Water Cutoff Err
- Low system water level / loss of pressure
- Air trapped in the boiler needing purging
- Closed or stuck isolation valve
- Circulator pump not moving water
- Faulty low water cut-off probe
What you can safely check
- Check the system pressure gauge for low or zero pressure
- Verify no isolation valves to the boiler were left closed
Beyond these checks, do not open the unit or touch gas/electrical parts — BC law requires a licensed gas fitter. Call us for a proper diagnosis.
Error Lo Water Cutoff Err usually leaves you without heat or hot water and can indicate a safety-related fault. Don't keep resetting it — call for priority after-hours Raypak repair.
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Parts often behind Raypak error Lo Water Cutoff Err
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Raypak Error Lo Water Cutoff Err Repair Across Metro Vancouver
Related Raypak Water & Flow Codes
Frequently Asked Questions
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