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Frozen condensate pipe

During the low temperatures we are currently seeing nationwide, it is possible that your condensate pipe may have frozen if the pipe runs outside of your property.

If your Glow-worm boiler is flashing with an F1, F4, F28 or an F29 code you can follow these simple steps:

The condensate pipe is usually white overflow pipe similar to that you may find on a washing machine or sink waste pipe, it allows your boiler to dispose of condensation to an outside drain via this pipe. The pipe will usually be located on the external wall outside from where your boiler is.

1. Check that your condensate pipe has actually frozen
If your Glow-worm boiler is showing one of the above codes on the boiler’s display screen or If you can hear bubbling and gurgling sounds coming from your boiler this is also another indicator.

2. Locate the frozen blockage within the condensate pipe
Usually your condensate pipe will be frozen on the most exposed external point this will normally be the end of the pipe just below the drain or around the bend where the insulation is at its thinnest.

3. Thaw your condensate pipe to remove the blockage
You can pour warm water along the condensate pipe to remove the ice blockage. Please do not use boiling water as this can damage the pipe. Use a suitable container like a watering can and continue the process until either the ice falls from the pipe or until contents of pipe are fully drained.

4. Restart your boiler once ice blockage has been removed
You should always check your boiler manual for instructions on how to reset your boiler correctly before undertaking this operation, then you should restart your boiler.

You can avoid having to repeat this process in future by insulating your condensate pipe. By insulating your condensate pipe you are reducing the risk of it freezing and blocking again in future. All good DIY stores should sell pipe insulation, this can easily be fitted with little effort.