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Error code reference

Trane Furnace Error Code ERR 114

Bad or missing personality module-data section corrupt, compressor size mismatch, blower HP/OEM mismatch, no PM, or PM memory error.

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What the ERR 114 error code actually means

Your Trane furnace is showing an error because a small data chip called the personality module is either missing, damaged, or programmed with the wrong settings for your system. This chip tells the furnace control board what size components it is working with, and without that correct information the furnace will not run. A technician will need to inspect or replace this chip to restore normal operation.

Diagnostic procedure

The full ERR 114 procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

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1
Confirm the fault
Power cycle the unit: switch off the breaker for 60 seconds, then restore power. If the code returns, the fault is persistent and the procedure below isolates the cause.
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Most common causes of ERR 114

Ranked by how often they cause this code
  1. 1Missing personality module
  2. 2Corrupt PM memory
  3. 3Compressor size mismatch
  4. 4Blower HP mismatch
  5. 5Failed or damaged control board PM interface

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Questions people ask about ERR 114

What does ERR 114 mean on a Trane furnace?
ERR 114 indicates a problem with the personality module, a small configuration chip that stores data about the system's compressor size and blower motor horsepower. The error is triggered when the module is missing, has corrupt memory, contains mismatched specifications, or cannot be read by the control board. The furnace will not operate normally until the personality module issue is resolved.
Will resetting the furnace clear ERR 114?
No, a simple reset will not clear ERR 114. The error is caused by a hardware or data condition with the personality module, not a transient fault. Each time the control board attempts to read the PM and encounters the same problem, the error will return. The underlying cause, whether a missing, corrupt, or mismatched module, must be corrected before the error will clear.
How much does it cost to repair ERR 114 on a Trane furnace?
Repair costs depend on the root cause. If only the personality module needs to be replaced, parts and labor typically range from around $150 to $400 depending on the specific module required and local labor rates. If the control board itself is also damaged or needs replacement, total costs can rise to the range of $400 to $900 or more. A technician's diagnostic visit is usually needed first to determine exactly which component is at fault.
Can I fix ERR 114 on my Trane furnace myself?
In some cases a homeowner or experienced DIYer can check whether the personality module is physically present and fully plugged into its connector on the control board. However, replacing or sourcing the correct replacement PM requires knowing the exact compressor and blower specifications for your specific unit, which can be complex to verify without technical resources. For most homeowners, this repair is best handled by a qualified HVAC technician.
Is it safe to run my Trane furnace with ERR 114 active?
The furnace is designed to halt normal operation when ERR 114 is present, which means it will not run in a misconfigured state. You should not attempt to bypass this error, as the personality module data is used to ensure the control board operates the compressor and blower within their correct parameters. Leave the unit off and contact an HVAC technician to diagnose the module issue.

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