Customer is having issues with multiple radiant heat zones in the home: Some thermostats flash heat on when there is a call for heat and others are not reaching set temp and steady heat on The back bedroom on the second floor is not reaching set temperature- - Identify the circulator pump in the basement that controls this zone - Identify the zone in the zoning panel that controls this back bedroom zone - Confirm that the zone is calling for heat and the circulator pump is getting 120 V - Water is not circulating in the zone in the zone was bled on Friday- found an air bubble, trapped inside of the circulator pump and after bleeding on pump side and return side water is now circulating properly and supply and return our heating down at the boiler room and in the manifold below the thermostat - The zone was cycled on and off multiple times to confirm that it was operational The customer also stated that multiple thermostats flash “ HEAT ON” with a call for heat but do does not t