Trane DHK300A(3,4,W)*(0,A)(L,M,H)***4 Ignition 7 Flash: W2 call before W1 on electromechanical units
The Trane Precedent gas heat fault-code table identifies 7 flash as W2 call before W1 on electromechanical units, with low-voltage, thermostat, splice, or W1/W2 wiring concerns listed as possible issues.
Trane DHK300A(3,4,W)*(0,A)(L,M,H)***4 Ignition Off: No power or ignition-board failure
The Trane Precedent gas heat fault-code table identifies ignition-board LED off as no power or board failure.
Trane DHK300A(3,4,W)*(0,A)(L,M,H)***4 Ignition Fast Flash: Ignition board not communicating with RTRM
The Trane Precedent gas heat fault-code table identifies fast flash as not communicating with the RTRM, with communication wiring, ignition module, or RTRM concerns listed as possible issues.
Trane DHK300A(3,4,W)*(0,A)(L,M,H)***4 Ignition 2 Flash: System lockout from flame-sense failure
The Trane Precedent gas heat fault-code table identifies 2 flash as system lockout from failure to sense flame, with low-voltage grounding, gas valve, ignition board, flame sensor, wiring, burner crossover, or board issues listed as possible causes.
Trane DHK300A(3,4,W)*(0,A)(L,M,H)***4 Ignition 3 Flash: Pressure switch fault
The Trane Precedent gas heat fault-code table identifies 3 flash as pressure switch failed to open or close, with pressure switch, combustion blower, hose, flue fitting, airflow, or board concerns listed as possible issues.
Trane DHK300A(3,4,W)*(0,A)(L,M,H)***4 Ignition 4 Flash: High-temperature limit circuit open
The Trane Precedent gas heat fault-code table identifies 4 flash as TCO-1 or TCO-2 high-temperature-limit circuit open, with wiring, airflow, filter, indoor blower, switch, or board issues listed as possible causes.
Trane DHK300A(3,4,W)*(0,A)(L,M,H)***2 Ignition 2 Flash: System lockout from flame-sense failure
The Trane Precedent gas heat fault-code table identifies 2 flash as system lockout from failure to sense flame, with low-voltage grounding, gas valve, ignition board, flame sensor, wiring, burner crossover, or board issues listed as possible causes.
Trane DHK300A(3,4,W)*(0,A)(L,M,H)***2 Ignition 3 Flash: Pressure switch fault
The Trane Precedent gas heat fault-code table identifies 3 flash as pressure switch failed to open or close, with pressure switch, combustion blower, hose, flue fitting, airflow, or board concerns listed as possible issues.
Trane DHK300A(3,4,W)*(0,A)(L,M,H)***2 Ignition 4 Flash: High-temperature limit circuit open
The Trane Precedent gas heat fault-code table identifies 4 flash as TCO-1 or TCO-2 high-temperature-limit circuit open, with wiring, airflow, filter, indoor blower, switch, or board issues listed as possible causes.
Trane DHK300A(3,4,W)*(0,A)(L,M,H)***2 Ignition 6 Flash: Flame rollout circuit open
The Trane Precedent gas heat fault-code table identifies 6 flash as flame rollout circuit open, with restricted combustion airflow, flue debris, heat exchanger, gas-orifice alignment, combustion motor, or turbulator concerns listed as possible issues.