02 High side fault or high pressure switch trip

What the control is telling you

Code 02 covers two high-side events: (1) four protector trips in a row with an average run between 1 and 15 minutes while both pressure switches are closed; (2) the high pressure switch has opened - compressor and fan off with a call present.

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 (switch-trip version)

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. Check for overcharge or non-condensables if the coil and fan are fine.
5. Test the high pressure switch it should open at 610 psig (plus or minus 10) and close at 420 psig (plus or minus 25).
6. High side fault version clears after 4 normal cycles in a row, or by power cycling the 24 VAC.

Models that show this code

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

Other codes on the same units

• 01 Low side fault or low pressure switch trip
• 03 Short cycling
• 04 Locked rotor
• 05 Open circuit - compressor off over 4 hours
• 06 Open start circuit
• 07 Open run circuit
• 08 No line voltage
• 09 Low 24 V control voltage