Maximum average ΔT of supply and return sensor for hot water is repeatedly exceeded. Operation is normally possible for the central heating installation during the block. The pump continues to operate at minimum capacity during the block.
Check ? ow through the boiler and DHW tank See the installation instructions for the hydraulic connections to the boiler Possible causes: (radiator) shut-off valves closed or blocked water ?lter resistance (coil) in tank to high (see pump height). Check 3-way-valve on function and pollution.
