Lennox XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump SOLID GREEN Error Fix: Normal — Standby

Error code SOLID GREEN on the Lennox XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump means: Normal — Standby. The outdoor unit control board has power and is operating normally, waiting for a call from the thermostat.

The most successful fix is "Test and Replace Thermostat or Control Board Wiring" (medium difficulty, ~60 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

This error is rated low severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Test and Replace Thermostat or Control Board Wiring") is rated medium difficulty and takes about 60 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Wire strippers, Wire nuts.

DIY cost: $10-$20. Professional repair typically costs $150-$250. Many homeowners save money by trying the top-ranked community fix first.

The Lennox XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump has 8 other known error codes, including: 1 FLASH YELLOW (High Pressure Switch Open), 2 FLASHES YELLOW (Low Pressure Switch Open), 3 FLASHES YELLOW (Compressor Thermal Overload), 4 FLASHES YELLOW (Short-Cycle Protection), ALERT 1 (Communication Loss — Outdoor Unit), and 3 more.

Error code SOLID GREEN also appears on 5 other Lennox models: CBX27UH Lennox Variable Speed Air Handler, ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner, XC21 Dave Lennox Signature Collection 21 SEER Variable-Capacity Air Conditioner, XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner, XP21 Dave Lennox Signature Collection 20 SEER Heat Pump. The fix may vary by model, so check each model's specific page for tailored repair steps.