FieldBench
Rheem codes

Rheem

EcoNet

Lockout

EcoNet comm / control

Stat, indoor, or data pair dropped. The communicating thermostat is the system.

Walk EcoNet in Diagnose

2 plates — walk the one on the cabinet

First check

1 Data pair, not 24 V

On Rheem R98MV indoor/outdoor comm is a data pair (AB, S1/S2, U, ComfortBridge, ComfortLink — whatever THIS plate uses). It is not a 24 V Y. Check polarity, continuity, and that nobody landed it on R/C. Data-pair landing and polarity. EcoNet is not R/W.

Expect: Pair continuous, not shorted to chassis, polarity per the diagram.

The rest of the walkthrough is Diagnose.

On the plates

  • Data-pair landing and polarity. EcoNet is not R/W.
  • 24 VAC still required at the control — comm dead is not ‘no transformer’ until you measure.
  • One EcoNet control. Do not stack a 24V stat on the data pins.
  • Stat diagnostics before you condemn the IFC.

Plates that use EcoNet