Cleaning A Combi Boiler

Powerflushing a Combi-boiler —  Internal layout of a combi

flow diagram - combi boiler
« The Primary Heat Exchanger
« Diverter Valve
« The domestic hot water (Plate) Heat Exchanger

It is essential that:

  1. The primary heat exchanger is clean, particulary if it is a condensing boiler. 
     noise, long warm up period, boiler locks out
  2. The diverter valve modulates between heating and hot water and will stick in hard water areas or excess sludge. 
     erratic hot water, lock out, temperature modulates.
  3. The waterways of the domestic HW plate heat exchanger are extremely small and block easily. 
     Reduced flow
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