25
Table 2. 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
Inverter
Flash
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
370
Service
Urgent
GF Interlock
Switch Open
Communicating Mode:
NOTE:
The on-board jumper
DS-R (W914)
will be cut.
In communicating mode, the
DS
-
R
terminal is used with the EL296 and SL280 furnaces and will
be used to monitor a field-installed interlock switch such as for example a float switch.
When operating in this capacity, the
DS
jumper will be monitored as follows:
•
When no alert codes are present there will be 24VAC present at this terminal.
•
When control see the loss of 24VAC for two minutes it will send an alert code 370 and disable
heating function.
• If currently running a demand it will de-energize all outputs (including the blower).
•
In case of an existing interlock switch alert code, upon power reset, an alert code message will
be sent if voltage is not sensed on the
DS
terminal.
•
An alert code clearing message will be sent if 24VAC is sensed on
DS
terminal for the minimum
of 10 seconds.
• The monitoring of
DS
terminal will apply to both variable speed and constant torque controls.
Non-Communicating Mode:
NOTE:
The on-board jumper
DS-R (W914)
will
NOT
be cut.
The furnace control has not received 24VAC power for two minutes or more on the
DS
terminal
• The system will not operate.
•
Dealer has cut the
W914
jumper (Dehum, Harmony III) on the Lennox furnace control.
• The thermostat monitors the
DS
terminal in the furnace for power and if the link has been cut then
power will be lost to
DS
.
• If
DS
to
R
terminal is accidentally cut you must reconnect a jumper from the
DS
to
R
on the
terminals strip.
This alert code will clear when 24VAC is
continuously sensed on
DS
terminal for
a minimum of 10 seconds or on a power
reset.
371
Service
Soon/Service
Urgent
AH Float Switch
Sensed Open
After being active for 10 minutes (600 seconds) the service soon condition will change to Service
Urgent.
Automatically clears after fault recovered.
380
Service
Soon/Service
Urgent
EIM Interlock
Relay Fault
Interlock relay failure (furnace or air handler modes only).
•
Interlock relay is energized, but input is not sensed after three seconds.
• There will be no heating or cooling due to this alert code – service soon condition.
•
De-energize interlock relay and energize after five minutes if demand is still present – service
urgent.
Automatically clears after fault recovered.
381
Service
Urgent
EIM Interlock
Relay Stuck
Interlock relay stuck (furnace or air handler modes only).
•
Interlock relay continuously sensed (with relay off).
• There is no heating and cooling operation – moderation condition.
• After 10 minutes if event still exist it will be escalated to priority condition service urgent.
Automatically clears 30 seconds after fault
clears.
382
Service
Urgent
EIM Relay W1
Fault
Relay
W1
failure (furnace or air handler modes only).
W1
relay is energized but input is not
sensed after three seconds.
Automatically clears when W1 relay input is
sensed.
