Safe visible checks
- Thermostat display and settings
- Filter condition and return-air path
- Visible outdoor-unit obstruction
- Photos of the code, unit, and nameplate
Product troubleshooting
Back to Trane DHJ150A(3,4,W)**(L,M,H)***4
Trane DHJ150A(3,4,W)**(L,M,H)***4 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.
Error-code table
Search codes for DHJ150A(3,4,W)**(L,M,H)***4
| Code | Meaning | System area | Safe first step | Action |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
No matching error codes found.
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.
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
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.
Anna G.
They quickly identified the issue with the heating system and fixed it efficiently. He explained everything clearly and made sure I understood what was going on. Very professional and reliable, extremely satisfied with the service.
John F.
I needed 2 new AC units and decided to go with high efficiency heat pumps. I chose Greenflow because of the equipment they offered, and the price (2nd lowest quote and much cheaper than the average of all quote we received). Their technicians were very detail oriented and...
Michele Z.
Andrey was professional, prompt, smart, thorough and exceedingly pleasant. We are likely switching our current HVAC company to Green Flow.