E17
Triangle Tube
Modulation / Fan-Gas Ratio Control Fault
E17 displayed, unit may not modulate correctly or may shut down under certain 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
Faulty fan speed feedback, Incorrect gas valve calibration, Control board modulation circuit failure, Wiring issue between fan and control
How to Fix / Troubleshooting
Warning: Combustion tuning affects safety and efficiency. Only trained personnel should adjust gas/air settings.
- 1. Power cycle: Turn power off for 30 seconds and back on to clear transient control errors. If E17 returns, continue.
- 2. Inspect wiring: Check the multi-pin connector between the control board and the combustion blower/gas valve assembly. Reseat and inspect for bent pins.
- 3. Observe operation: On a call for heat, listen for the blower ramping up and down. If speed changes are erratic or absent, the blower or control may be at fault.
- 4. Do not adjust gas valve screws: Gas valve calibration requires combustion analysis equipment. Do not attempt manual adjustments.
- 5. Professional diagnosis: A Triangle Tube technician should perform a full combustion analysis, verify fan speed feedback, and replace the blower or control board if necessary.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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