Triangle Tube
No Space Heating Circulation
No heat to radiators or underfloor loops, but the boiler appears to run.
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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
Failed system circulator pump, Air-locked system, Closed zone valves, Mixing valve stuck closed
How to Fix / Troubleshooting
Safety: Turn off power before opening electrical boxes or pump housings. Water may be hot.
- Step 1 – Check boiler status: Confirm the Triangle Tube boiler is firing and reaching the set temperature on the display.
- Step 2 – Feel piping: Carefully touch (briefly) the supply and return pipes leaving the boiler. If the supply is hot but downstream piping is cold, flow is not reaching the system.
- Step 3 – Verify pump operation: Listen and feel the system circulator. If silent, check its power switch, fuses, or relay. Replace the pump if it is powered but not turning.
- Step 4 – Check zone valves: Ensure motorized zone valves are opening when thermostats call for heat. Manually open them for testing if possible.
- Step 5 – Bleed air: Bleed air from high points and manifolds to restore circulation.
- Call a technician: For persistent no-heat issues, a professional should test pumps, valves, and the system design.
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Repair Difficulty
Medium
3/5
Required Part
System Circulator Pump
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