Lennox Heat Pump Error Code Simultaneous SLOW Flash (Green/Red)

This pattern means the heat pump is operating normally or is in standby mode. Both the green and red LEDs flashing slowly at the same time is a status indicator, not a fault code. No diagnostic action or repair is required when this pattern appears.

Yes, this condition is completely safe. The simultaneous slow flash pattern is the normal operating and standby indicator, meaning the control board has detected no fault conditions. You can continue using the system as normal.

No repair cost applies to this condition because it is not a fault. If a technician visit is needed to confirm system operation or investigate a separate concern such as insufficient heating or cooling performance, typical diagnostic service call fees can range from $75 to $150 depending on your region and service provider.

No repairs are needed. The simultaneous slow flash of the green and red LEDs confirms the system is healthy. If your heat pump is not heating or cooling despite this status display, the issue is likely with the thermostat settings or thermostat connection rather than the heat pump itself.

A reset is not necessary and will not change the underlying status, since this pattern indicates normal operation rather than a fault. After a reset, the control board will return to displaying this same pattern once it completes its startup sequence, assuming no actual faults are present.