Trane Horizon OABD Series Installation, Operation And Maintenance Manual page 101

Table 15. LED flash code keys for heat module UTEC 1016-xxx Ignition Board (continued)
LED Code System
3 Flashes Lockout
4 Flashes Lockout
5 Flashes Lockout
Table 16. LED flash code keys for two stage heat module UTEC 1171-63 Ignition Board
LED Code System
Heartbeat Normal
2 Flashes Inducer ON/No gas
3 Flashes No Flame
4 Flashes Lockout
OAU-SVX007A-EN
Troubleshooting Guide for UTEC 1016-xxx Ignition Board
Fault Description
Ignition locked out from too many
ignition attempts.
Ignition lockout from too many flame
losses within a single call for heat.
Control hardware fault detected.
Troubleshooting Guide for UTEC 1171-63 Two Stage Board
Fault Description
System is Normal.
airflow pressure switch contact is open;
Inducer blower is running.
Air pressure switch contact is closed
when Inducer blower is not running.
Failed to ignite after too many failed
attempts.
Alarms and Troubleshooting
Action
Ignition/flame sense failure.
1. Verify gas supply is available.
2. Verify gas safety valve is working correctly.
3. Verify gas manifold pressure is adequate and correct.
4. Check spark igniter is not cracked or dirty. Check spark igniter wire is not
covered with oil and debris or cracked. Check wire is connected correctly.
5. Check flame sensor wiring. Check to see if flame sensor is grounded.
Repeated flame losses.
1. Check pressure switch hose for leaks or poor connection.
2. Check for condensate in pressure switch hose.
3. Check pressure tap on Inducer blower and pressure switch for blockage.
4. Check functionality of Inducer blower.
Internal control fault.
Change ignition board.
Action
All conditions are normal.
None.
Pressure switch open with Inducer ON.
1. airflow pressure switch hose leaking; repair and/or replace.
2. airflow pressure switch hose plugged; repair and/or replace.
3. airflow pressure switch hose fittings plugged or damaged; repair and/or
replace.
4. Air pressure hose and/or switch has condensate accumulation; repair and/
or replace.
5. Air pressure switch not functioning; replace.
6. Inducer blower not working; repair or replace.
Pressure switch close with Inducer OFF.
1. Check wiring to the airflow pressure switch.
2. Check airflow pressure switch continuity with OHM meter; if not open
replace.
Lockout from too many failed ignition tries.
1. Confirm gas supply available; verify manifold gas pressure is correct.
2. Verify manual gas shut-off valve is open.
3. Verify Gas Safety Control valve is in ON position.
4. Confirm that spark is present and check spark igniter for debris between
electrodes.
5. Check for cracked ceramic; check for cracked, oil, debris, damaged or
disconnected connections on ignition wires.
6. Check for recirculation of exhaust gases.
7. If all above condition are OK, replace ignition board.
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