Like the heading says when ever the boiler decides it goes into test mode sometimes forgetting to end the T mode by itself.
Its an isar He35 that otherwise runs Ok except when in Dhw mode the rads heat up is this normal for this boiler or is the motorised valve playing up
Its an isar He35 that otherwise runs Ok except when in Dhw mode the rads heat up is this normal for this boiler or is the motorised valve playing up