69
Table 19. Alert Codes and Troubleshooting
Initial notification of critical alerts will pop-up on the home screen and will be listed under notification menu. Minor and moderate alerts are found only under the notification menu. Moderate alerts
are not e-mailed to Homeowners. Dealers will get an email and code can be seen on thermostat under the installer notification section.
NOTE:
Anytime the word
DEVICE
or
DEVICE2
is used in this table, it will be replaced on all alert code notification screens with the actual offending device name, for example, thermostat, heat
pump, etc.).
Alert
Code
Inverter
Flash
Code
Priority
Condition
Applicable
Component
Actual Displayed
Alert Text
Component or System Operational State and Troubleshooting Tip
273
Critical
Furnace
WatchGuard -
Flame fail in Run
Mode
The furnace flame is going off during a heating cycle. The system will go into Watchguard mode.
•
Check micro-amperes of flame sensor using thermostat diagnostics.
• Clean or replace sensor.
•
Measure voltage of neutral to ground to ensure good unit ground.
• Clean face of burner assembly.
Automatically clears when a heat call ends successfully.
274
Critical
Furnace
WatchGuard -
Primary Limit
Switch Open
The furnace limit switch has been open for more than three minutes. The system will go into Watchguard mode.
•
Check firing rate and air flow.
• Check for air blockage.
Automatically clears when a heat call ends successfully.
275
Critical
Furnace
WatchGuard -
Flame Out of Seq.
No Flame
The furnace flame is out of sequence. The system will go into Watchguard mode.
• Shut off gas.
•
Check for gas valve leak.
• Check for high gas pressure.
•
Low supply air due to being plugged or restriction in system (example: dirty air filter or blockage in duct work).
• Limit trips will place the iHarmony
®
zoning system into non-zone mode.
•
Check for proper firing rate on furnace.
• Check for non-functioning zone dampers.
NOTE:
Refer to Service and Application Note ACC-14-01 - iHarmony
®
and SLP98 - Insufficient
Zone Heating and Alert Code
250 Issues for corrective actions.
Automatically clears on successful ignition.
276
Critical
Furnace
WatchGuard -
Calibration Failure
The furnace is not able to calibrate or the high pressure switch opened or failed to close in run mode. The system will go into
Watchguard mode (furnace will lock out for one hour and then try again).
• Measure operating pressure (inches w.c.).
•
Inspect vent for blockages, and combustion air inducer for correct operation and restriction.
• Check for blocked cold end heater box (CEHB), or condensate drain or drain strainers at outlet of CEHB and cracked hoses.
• Check for cracked hoses.
•
Check levelness of unit.
NOTE:
Check Service Manual and Service and Application Note
H-13-07
“Condensing Furnace Pressure Switch
Troubleshooting” for additional information.
Automatically clears when the furnace calibrates itself successfully.
