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Michael B
Michael B Member Posts: 179
in THE MAIN WALL
have a Vitodens 11-44 with indirect and 2 hot water coils connected to variable speed air handlers.
Variable speed ahu working fine.
Boiler shows no faults
Domestic tank is 66 degrees and boiler showing domestic hot water pump calling but the pump does not run?
Thermostats are calling for heat, hot water coil pumps are running but the pump connected to the return side of boiler (UP26-96) does not run?
Both pumps are connected to Viessmann Power Pump moduale. The comfort-trol is working but the pumps are not?

any thoughts? Seriously stumped in Chicago

Michael Bleier
Able Distributors
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