Lennox Heat Pump Error Code DS2:SimultaneousSlowFlash / DS1:SimultaneousSlowFlash

This status pattern means the heat pump is operating normally or is in standby mode. Both diagnostic LEDs flashing together in a slow, synchronized pattern is the control board's way of signaling that no faults are present. No diagnostic action or repair is required when you see this pattern.

Yes, it is completely safe. The simultaneous slow flash pattern confirms the system is in a healthy operating state. There are no safety concerns, refrigerant issues, or electrical faults associated with this specific LED pattern.

There is no cost associated with this status because it indicates normal operation, not a fault. No parts, labor, or service visit is required. If you called a technician specifically for this LED pattern, you may still be charged a standard diagnostic visit fee, which typically ranges from $75 to $150 depending on your region and provider.

No action is required. This is a normal status indication, not a fault or warning code. If your system is heating or cooling your home as expected, the unit is performing correctly. If you have comfort concerns despite this status, check your thermostat settings and setpoints first.

A reset is not necessary and will not change the underlying behavior, since this is not a fault code. After a power cycle, the control board will simply return to this same normal-operation status pattern once it completes its startup sequence. Resetting the unit unnecessarily can briefly interrupt comfort and is not recommended.