Glow-worm
Frozen or restricted condensate / air in heat exchanger
Furnace locks out more often during very cold weather, accompanied by gurgling sounds.
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Possible Causes
Frozen external condensate pipe, air trapped in Glow-worm primary heat exchanger, low system pressure, inadequate pipe insulation.
How to Fix / Troubleshooting
Safety: Take care when working outside in icy conditions.
User steps:
- Check and thaw the external condensate pipe if frozen using warm water.
- Top up system pressure to the recommended level if low.
- Bleed radiators to remove air.
Technician steps:
- Bleed air from the heat exchanger and high points in the system.
- Insulate external condensate pipework and increase diameter if necessary, according to Glow-worm recommendations.
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Repair Difficulty
Easy
2/5
Required Part
Condensate Pipework
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