Product troubleshooting

Trane WHK048AW0*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.

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Error-code table

Search codes for WHK048AW0*4

Search error codes

Code	Meaning	System area	Safe first step	Action
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
RTRM LED2 2 Flashes	ReliaTel diagnostic present	ReliaTel RTRM controls	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
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
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
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
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
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

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.