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Bosch · Heat pump

F4 Pressure transducer fault

Medium severity Bosch IDS Light

What the control is telling you

The pressure transducer is not reading correctly.

Applies to: Bosch IDS Light BOVA15 (24/36/60) R-454B heat pump outdoor units

Likely causes

  • Loose CN16 connection
  • Damaged transducer
  • Control board

Test and repair steps

  1. Check the connection at CN16.
  2. Replace the pressure transducer; replace the board if needed.

Models that show this code

3 models in Bosch IDS Light

BOVA15-24BOVA15-36BOVA15-60

Other codes on the same units

  • E52 DC bus voltage out of range
  • E81 EEV coil fault
  • F1 High pressure switch protection
  • F2 System lockout (5 low-pressure trips in 100 minutes)
  • F41 High pressure sensor fault
  • F42 Low pressure sensor fault
  • H01 Drive chip communication fault
  • J00-JCF Compressor driver fault

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Source: Bosch IDS Light installation BTC 762003308 D (02.2025), Fault Code Table 23 and 17.12 Error Code Troubleshooting, p.42-59. 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.