Goodman CONDENSING UNIT HEAT PUMP Installation & Service Reference page 15

LED LED Status
Off
1 Flash
Red Communications
LED
2 Flashes
Off
1 Steady Flash
Green Receive LED
Rapid Flashing
On Solid
Indication
• Normal condition • None
• Communications Failure • Communications Failure
• Out-of-box reset • Control power up
• Learn button depressed
• No power • No power to furnace
• Communications error • Open fuse
• Communications error
• No network found • Broken/ disconnected data
wire(s)
• Heat pump is installed as a
legacy/ traditional system
• Normal network traffic • Control is "talking" on
network as expected
• Data 1/ Data 2 miss-wire • Data 1 and data 2 wires reversed
at heat pump, thermostat, or
CT compatible indoor unit
• Short between data 1 and
data 2 wires
• Short between data 1 or
data 2 wires and R
(24VAC) or C (24VAC
common)
Possible Causes Corrective Action(s)
• None
• Depress Learn Button
• None
• Check fuses and circuit
breakers; replace/reset
• Replace blown fuse
• Check for shorts in low
voltage wiring in
heat pump/system
• Reset network by
depressing learn button
• Check data 1/ data 2
voltages
• Check communications
wiring (data 1/ data 2
wires)
• Check wire connections at
terminal block
• Verify heat pump
installation type (legacy/
traditional or
communicating)
• Check data 1/ data 2
voltages
• None
• Check communications
wiring (data 1/ data 2
wires)
• Check wire connections at
terminal block
• Check data 1/ data 2
voltages
15
Notes & Cautions
• None
• Depress once quickly for a
power-up reset
• Depress and hold for 2
seconds for an out-of-box
reset
• None
• Turn power OFF prior to
repair
• Turn power OFF prior to
repair
• Verify wires at terminal
blocks are securely twisted
together prior to inserting
into terminal block
• None
• Turn power OFF prior to
repair
• Verify wires at terminal
blocks are securely twisted
together prior to inserting
into terminal block