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Back to Trane UHMC100CCV4

Trane UHMC100CCV4 troubleshooting and error codes

Use this table to identify what the visible code may mean and what information to share when scheduling service. Keep checks simple and visible; do not open electrical, refrigerant, gas, or sealed equipment compartments.

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Error-code table

Search codes for UHMC100CCV4

Code Meaning System area Safe first step Action
Flashing Slow Normal - no call for heat Integrated furnace control Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Flashing Fast Normal - call for heat Integrated furnace control Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Continuous ON Replace IFC Integrated furnace control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Continuous OFF Check power Integrated furnace control power Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
2 Flashes System lockout Ignition and operating lockout Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
3 Flashes Draft pressure error Draft pressure circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
4 Flashes Open high-limit device High-limit safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
5 Flashes Flame sensed when no flame should be present Flame sensing Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
6 Flashes 115 volt AC power reversed or poor grounding Power and grounding Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
7 Flashes Gas valve circuit error Gas valve circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
8 Flashes Low flame sense signal Flame sensing Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
9 Flashes Ignitor circuit or line-neutral/common voltage issue Ignitor and grounding circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details

Safety note

What is safe to check before service

These pages are meant to help document the issue, not replace diagnosis. GreenFlow should handle pressure-switch, electrical, refrigerant, lockout, recurring, and warranty-related conditions.

Safe visible checks

  • Thermostat display and settings
  • Filter condition and return-air path
  • Visible outdoor-unit obstruction
  • Photos of the code, unit, and nameplate

Stop and call

  • Repeated lockouts or recurring faults
  • Pressure-switch or sensor faults
  • Electrical odor, unusual noise, or ice buildup
  • Any sealed cabinet, refrigerant, gas, or warranty issue

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