Raypak
Short Cycling / Flame Dropout
The heater starts but shuts off after a few seconds to a minute; it may cycle repeatedly.
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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
Weak flame signal at the flame sensor, Dirty burners or heat exchanger, Marginal gas pressure, Overheating causing the high limit to open
How to Fix / Troubleshooting
Safety first: Turn off power and gas before cleaning burners or sensors.
Steps to address short cycling:
- Clean flame sensor: Remove and clean the flame rod with a fine abrasive pad. Reinstall and ensure proper positioning in the flame.
- Clean burners: Remove the burner tray and brush off rust, scale, and debris. Blow out burner ports with compressed air.
- Check water flow: Ensure the pump is running properly and the filter is clean to avoid overheating and high limit trips.
- Gas supply check: If flames appear weak or noisy, have a technician verify inlet and manifold gas pressures.
Note: Persistent short cycling can damage components and should be corrected promptly.
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Repair Difficulty
Hard
4/5
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