F36
Protherm
Flue Gas Safety / Blocked Flue Detection
F36 error, appliance detects flue gas recirculation or blocked flue conditions
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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
Blocked flue terminal, Incorrect flue length or configuration, Damaged flue seals, Strong wind effects on terminal
How to Fix / Troubleshooting
Safety first: Turn off power and gas. Do not operate the heater until the flue system is verified safe.
- Inspect terminal and flue: Remove any obstructions and verify that the flue is installed according to Protherm guidelines.
- Check seals and joints: Replace any damaged seals and ensure all joints are gas-tight.
- Assess terminal location: Ensure the terminal is not in a location prone to recirculation (e.g., under balconies, near corners) contrary to installation rules.
- Professional test: Have a technician perform a flue gas and draft test.
Warning: Blocked flues can cause carbon monoxide accumulation; treat F36 as a serious safety issue.
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Repair Difficulty
Professional Required
5/5
Required Part
Flue System (Concentric Flue Kit)
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