Indoor And Outdoor Error Codes - Lennox MS8 SERIES Installation And Service Procedures

Indoor and Outdoor Error Codes

This section identifies error codes that appear on the front panel of the indoor unit or outdoor unit control. Many of the error
codes will automatically clear themselves when the error no longer exist. However some error codes may required
disconnecting power to the system at the unit disconnect switch or circuit breaker in order to clear them and resuming system
operations.
* The temperature readout (either temperature setpoint or indoor ambient) will be replaced by an error code if there
is a malfunction. If multiple errors are detected, the display will alternate between each error code. On the 30kBtu
system, the indoor ambient temperature will only display in centigrade.
NOTE - No history is kept on past error codes.
INDOOR UNIT FRONT PANEL INDICATORS
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FIGURE 71
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Corp. 1244-L9