Triangle Tube
Short Cycling / Oversized or Miscontrolled System
Water heater frequently short cycles, turning on and off rapidly even with demand present.
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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
Oversized boiler relative to load, Incorrect control settings, Low water content system without buffer, Faulty thermostat placement
How to Fix / Troubleshooting
Safety: Short cycling reduces efficiency and can damage components over time.
- 1. Check thermostat settings: Ensure thermostats are not set with extremely narrow differentials or in locations with rapid temperature swings (e.g., near vents).
- 2. Review control parameters: In the installer menu, verify minimum run times, anti-cycling times, and modulation settings per Triangle Tube recommendations.
- 3. System volume: Small radiant or baseboard systems may need a buffer tank to prevent short cycling. Consult with a heating professional.
- 4. Pump control: Ensure pumps are wired and controlled correctly so that flow continues for a short period after burner shutdown.
- 5. Professional assessment: A technician can perform a load calculation and recommend piping or control changes to reduce cycling.
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Repair Difficulty
Hard
4/5
Required Part
System Buffer Tank (if added)
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