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Back to Trane DHC102HW*(L,M,H,X,Y,Z)A***7

Trane DHC102HW*(L,M,H,X,Y,Z)A***7 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 DHC102HW*(L,M,H,X,Y,Z)A***7

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
Ignition Off No power or ignition-board failure Precedent gas heat ignition board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
RTRM LED2 1 Blink Emergency stop open during test mode ReliaTel RTRM controls Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. 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
Ignition Fast Flash Ignition board not communicating with RTRM Precedent gas heat ignition board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
RTRM LED2 2 Flashes ReliaTel diagnostic present ReliaTel RTRM controls Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Continuous ON Replace IFC Integrated furnace control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Ignition 2 Flash System lockout from flame-sense failure Precedent gas heat ignition board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Service output ON Clogged filter switch active ReliaTel service output Document the flash pattern, check thermostat, filter, and visible outdoor-unit obstruction status, and schedule service if the condition remains. View details
Continuous OFF Check power Integrated furnace control power Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Ignition 3 Flash Pressure switch fault Precedent gas heat ignition board Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Service output Pulsing Fan, freeze, smoke, or condensate diagnostic ReliaTel service output 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
Cooling output Pulsing Cooling circuit or pressure diagnostic ReliaTel cooling output Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Ignition 4 Flash High-temperature limit circuit open Precedent gas heat ignition board 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
Heat output Pulsing Heat or gas-heat diagnostic ReliaTel heating output Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Ignition 5 Flash Flame sensed when gas valve is not energized Precedent gas heat ignition board 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
Heat + Cool Heat-pump sensor, defrost, phase, smoke, Frostat, or communication diagnostic ReliaTel simultaneous fail codes Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Ignition 6 Flash Flame rollout circuit open Precedent gas heat ignition board 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
Cool + Service Static pressure transducer diagnostic ReliaTel VAV/static pressure controls Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Ignition 7 Flash W2 call before W1 on electromechanical units Precedent gas heat ignition board 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
Heat + Cool + Service High duct static pressure trip or transducer ground issue ReliaTel VAV/static pressure controls 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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Our Happy Customers

Michael C.

always available, easy to get a hold of, as a property manager I get lots no heat emergency, usually get to it same day or next day

Randy J.

Thanks to Andrey for an amazingly quick response to my request for a service call. He diagnosed and fixed my issue within 24 hours of my asking for help. Excellent service. Thanks.

Jahangir R.

They were very organized to communicate and be on time to come to look at my air condition to fix it.

Anna F.

They showed up within an hour of me making the call on a Sunday. They fixed our system and taught us how to replace the fuse in the future. We would definitely call again.

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