EWC Controls Forum

Just to clarify the issue, I tried swapping the dip switch #2 to the HP position and the end result was the same. The thermostat says that heat is on, the fan for the heater comes on as it should, but the heater does not heat the air. Can this be a wiring issue or it possible that the heating unit ...

The Thermostats are Honeywell TH4110D1007 units.

I have a two zone heating / cooling system using a NCM 300 Ultrazone controller, a Rheem model RHSL-HM2417JA air handler and a Rheem 13PJL24A01 heat pump. The zones are controlled by EWC MAND4 control valves. This was placed in to a new construction building by a local small contractor. At one point ...