L2 Lockout - high pressure switch tripped 3 times

What the control is telling you

The high pressure switch opened 3 times in one thermostat call and the control locked out the outdoor unit. (The manual's symptom column says low pressure switch here - treat as a misprint; the fault name is high pressure lockout.)

Applies to: Communicating 2-stage condensers and heat pumps with the PCBHR104 or PCBHR105 outdoor control (7-segment display): ASXC16/18, GSXC16/18, DSXC16/18, ASZC16/18, GSZC16/18, DSZC16/18

Likely causes

• Dirty or blocked outdoor coil
• Outdoor fan motor not running
• Outdoor fan wiring or capacitor failure
• Faulty high pressure switch

Test and repair steps

1. Warning: Kill power to the outdoor unit before touching wiring, the compressor terminals or the control.
2. Clean the outdoor coil and clear anything blocking air to or from the unit.
3. Check the outdoor fan motor runs; check its wiring and run capacitor and replace failed parts.
4. Test the high pressure switch (opens 610 +/- 10 psig, closes 420 +/- 25 psig).
5. To reset a lockout, interrupt the 24 VAC supply to the outdoor control (power cycle the low voltage), then retest.

Models that show this code

24 models in Goodman/Amana ComfortNet ASZC/GSZC/DSZC

Other codes on the same units

• d4 Shared data from the loader rejected
• E5 Outdoor control low-voltage fuse open
• H8 High line voltage
• L1 Lockout - low pressure switch tripped 3 times
• L6 Lockout - open start circuit detected 4 times
• L7 Lockout - open run circuit detected 4 times
• L8 Low line voltage
• P0 Compressor protector open