Glow-worm Short cycling / control mismatch

Furnace cycles on and off frequently, rooms never reach set temperature

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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 furnace relative to system, Incorrect thermostat location, Faulty room thermostat, Flow restriction in Glow-worm primary circuit

How to Fix / Troubleshooting

Safety: Short cycling can reduce component life but is not usually an immediate hazard.

User steps:

  • Ensure room thermostat is not located near heat sources or in direct sunlight.
  • Check that all radiators are open and heating evenly.

Technician steps:

  • Verify correct thermostat operation and replace if faulty.
  • Balance the heating system to improve heat distribution.
  • Adjust boiler control parameters (e.g., anti-cycling time, flow temperature) within Glow-worm guidelines.
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Repair Difficulty

Medium 3/5

Required Part

Room Thermostat / System Balancing
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