What It Means
Inverter communication break (V9+) or suction thermistor out of range (V8/earlier).
Bryant Heat Pump
Bryant Heat Pump Error Code 58
Troubleshooting guide for the Bryant Heat Pump system fault 58.
Possible Causes
- Loose or damaged inverter communication harness (V9+).
- Faulty inverter board (V9+).
- Suction thermistor out of range or damaged wiring (V8 and earlier).
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
New to this code? Click to see why this happens
Full Diagnosis
Lost Inverter Communication Event (V9+) / Suction Thermistor Range Fault (V8 and earlier). Communication or thermistor fault detected. This is one of Bryant's version-dependent codes, so the same numeral means two different faults depending on control board software: on V9+ boards it flags a break in the serial link between the control board and inverter module, halting inverter-driven compressor operation until communication is restored; on V8 and earlier boards it instead flags a suction thermistor reading outside its valid range, disabling temperature-dependent protections such as suction over-temp monitoring that rely on that sensor. Either way the outdoor unit stops running the affected function while the indoor blower and any backup heat keep operating. It differs from code 48 (Lost Inverter Communications), which is the non-version-specific communications-loss code present across all software versions, whereas 58's communications meaning applies only to V9+ boards — confirm software version before diagnosing, since chasing inverter wiring on a V8 board when the real issue is a suction thermistor wastes a service call.
All Recorded Causes
First confirm control board software version (V9+ vs. V8 or earlier) since the fault meaning depends on it. V9+: check inverter communication wiring and connectors for damage or looseness, and power cycle the unit to attempt to re-establish the link before replacing the inverter board. V8 and earlier: check suction thermistor wiring for damage and measure resistance against the temperature/resistance chart at the current suction line temperature. Replace whichever component — inverter board or suction thermistor — is confirmed faulty for the board's software version; replacing the wrong one will not clear the code.
Verify Before Replacing Parts
- Confirm the exact Bryant model family and heat pumps context before acting on a generic code description.
- Confirm board LEDs, wiring polarity, and model compatibility before replacing control boards — this Bryant fault points at first confirm control board software version (V9+ vs.
- Check for intermittent communication faults caused by connectors, moisture, or damaged harnesses, and rule out v8 or earlier) since the fault meaning depends on it.
- After the correction, run the system long enough to confirm the heat pumps fault does not return under normal load.
Still unsure about this fault?
ACLogics walks you through Bryant Heat Pump diagnostics step-by-step — so you confirm the cause before swapping parts.
