Dimplex Frozen Condensate (Weather-Related Lockout)

Boiler does not fire in very cold weather; external condensate pipe is exposed

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Possible Causes

Inadequately insulated Dimplex condensate pipe, Long external condensate run with insufficient fall, Small-diameter pipe prone to freezing

How to Fix / Troubleshooting

Safety first: Take care when working outside in icy conditions. Surfaces may be slippery.

User steps:

  • Thaw condensate pipe: Pour warm (not boiling) water along the external Dimplex condensate pipe to melt ice.
  • Insulate: Once thawed, fit suitable weatherproof insulation around the external pipe to reduce future freezing.
  • Reset boiler: After thawing, reset the Dimplex boiler and confirm normal operation.

Professional improvements:

  • Reroute or upsize the Dimplex condensate pipe to meet best practice for cold climates.
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Repair Difficulty

Easy 2/5

Required Part

Dimplex condensate pipe
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