Rx LED on solid Green receive LED on solid - data lines miswired or shorted

What the control is telling you

The data lines are reversed or shorted.

Applies to: GMVC95/AMVC95 upflow and *CVC9 counterflow two-stage furnaces

Likely causes

• Data 1 and data 2 swapped at the furnace, thermostat or outdoor unit
• Short between data 1 and data 2
• Short from a data wire to R or C (24 V)

Test and repair steps

1. Safety turn power off before working on the control or wiring.
2. Check data 1 / data 2 are on the same terminals at the furnace, thermostat and outdoor unit.
3. Check for shorts between the data wires and to R or C.
4. Twist wires before inserting them into the terminal block.
5. Check the data 1 / data 2 voltages.

Settings for these units

• Normal status displays (7-segment) · Goodman/Amana GM9S96/AM9S96
• Normal status displays (7-segment) · Goodman/Amana GM9S80/AM9S80
• Normal status displays (7-segment) · Goodman/Amana GM9C96/AM9C96
• Minimum recommended filter size · Goodman/Amana GM9C96/AM9C96

Models that show this code

10 models in Goodman/Amana *MVC95/*CVC9 two-stage ComfortNet

Other codes on the same units

• HI High-stage heat
• OP Normal - waiting for a call
• Red LED 1 flash Red communications LED 1 flash - communication failure
• Red LED 2 flashes Red communications LED 2 flashes - reset in progress
• Red LED off Red communications LED off - normal
• Rx LED 1 steady flash Green receive LED single steady flash - no network found
• Rx LED off Green receive LED off - no power or communications error
• Rx LED rapid flash Green receive LED rapid flashing - normal network traffic