How To Put Baxi Boiler In Service Mode: Max & Min Rate

Learn how to put put Baxi, Potterton, and Main boilers into service mode. Maximum Rate and minimum rate are sometimes needed for flue testing, gas rates and boiler repairs.
Make sure the heating is on and the boiler is calling for heat. The radiator icon light will be green.
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[@satpal2824]

what is this service mode used for?

[@HouseWarm]

It's to make the boiler run at maximum rate and minimum rate for doing tests.