14
Table 6.
Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), PA=Pure Air S,
ZA=Zone system and TS=Thermostat
Alert
Code
Priority
Condition
Actual Displayed
Alert Text
Under dealer
control center >
Notifications
Component or System Operational State
and Troubleshooting Tip
How to clear alert code
120
Service Soon
Unresponsive
Device
There is a delay in the system component responding to the
system. Typically this alert code does not cause any operational
issues and will clear on its own.
• This alert code is usually caused by a delay in the outdoor unit
responding to the thermostat.
• Leaking voltage from strands within the bundle.
> Land only the
R
wire on the
R
terminal to load the bundle with
24VAC.
►
Typically only the
R
wire needs to be landed to identify if
voltage is leaking.
►
If voltage is present checking the other wires is informational
only but not needed.
►
If voltage is not present checking the other wires one at a
time would be needed.
> Check each loose wire in AC mode to
C
on circuit board.
► Good voltage is .03 -.3VAC leaking voltage is not the issue.
►
Acceptable can be up to .7VAC with moderate success.
► Some units have worked with up to 1.2VAC with occasional
success.
► Voltage over 1.2VAC needs to be addressed.
Automatically clears after an
unresponsive system component
(device) responds to any inquiry.
124
Service
Urgent
Tstat Lost
Communication
To Smarthub
The thermostat has lost communication with a system component
for more than three minutes. System component has lost
communication with the thermostat.
• Check the wiring connections between components.
•
Ohm wires.
• Cycle power.
•
Any component that is miss-wired may cause a false component
code to be shown on system component.
• Disconnect all wiring to other system components and check
communication one at a time.
NOTE:
When using a float switch, use isolation relay to break
common wire to outdoor unit. For testing purposes, re-
move float switch from the circuit
This alert code stops all associated system operations and waits
for a heartbeat message from the system component that is not
communicating.
Automatically clears after
communication is re-established
with applicable system component
(device).
125
Service
Urgent
Control
Hardware
Problem
There is a hardware problem on a system component control.
There is a control hardware problem.
• In system using iHarmony zoning, the system will remain in
non-zone mode (all dampers open) for five minutes after priority
condition no longer exist.
•
In systems using a Equipment Interface Module, remove jumper
if present on indoor unit between
R
and
W2
.
• In systems using a PureAir
S
, the pure air control board jumper
selector is missing.
If none of the above tips are applicable, then replace the control if
the problem prevents operation and is persistent.
Automatically clears five minutes
after the issue no longer exists.
126
Service
Urgent
Control Internal
Communication
Prob
There is an internal hardware problem on the system component
control. In addition, if you have zoning the alert code is triggered
when your zone temperature is deviating away from set point
persistently.
• Typically the system component control will reset itself.
•
Replace the system component (device) control if the problem
prevents operation and is persistent.
Automatically clears 300 seconds
after the issue no longer exists.
