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KeepRite · Heat pump

73 Contactor stuck closed

High severity KeepRite *SA/*SH Single-Stage CommunicatingKeepRite *CA/*CH Two-Stage Communicating

What the control is telling you

Compressor voltage is present with no call for the compressor.

Applies to: KeepRite *SA5/*SA6 AC and *SH4/*SH5/*SH6 HP single-stage communicating; *CA7/*CA9 AC and *CH6/*CH9 HP two-stage communicating

Likely causes

  • Welded contactor contacts
  • Wiring error

Test and repair steps

  1. Warning: compressor may run with no call - kill power before work.
  2. Inspect contactor contacts and replace if welded.
  3. Check control box wiring.

Models that show this code

11 models in KeepRite *SA/*SH Single-Stage Communicating, KeepRite *CA/*CH Two-Stage Communicating

*CH624*CH636*CH648*CH660*CH924*CH936*CH948*CH960*SH4*SH5*SH6

Other codes on the same units

  • 55 Outdoor coil sensor fault
  • 56 Air and coil sensors disagree
  • 71 Low stage thermal cutout
  • 72 Compressor thermal cutout (two-stage: high stage)
  • 74 No 230 V at compressor
  • 81 Low stage thermal lockout
  • 82 Thermal lockout (two-stage: high stage)
  • 83 Low pressure lockout

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Source: KeepRite/ICP C4A3/H4A3/T4A3/CXA6 Installation Instructions 421 01 5103 05, Table 1 Status Codes, p.17; KeepRite_ICP_KeepRite_Tempstar_Heil_split_A_C_HP_R_410A_R_22_service_421_08_5400_04.txt - section Table 13 Status Codes (single-stage); KeepRite_ICP_KeepRite_Tempstar_Heil_split_A_C_HP_R_410A_R_22_service_421_08_5400_04.txt - section Table 17 Troubleshooting (two-stage). Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.