Trane Foundation GBC Series, Installation, Operation And Maintenance Manual

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34 RT-SVX069A-EN
Troubleshooting
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Standard Troubleshooting
The IGN has the ability to provide the service personnel
with some unit diagnostics and system status
information.
Before turning the main power disconnect switch
“Off”, follow the steps below to check the Ignition
Module (IGN).
To prevent injury or death from electrocution, it is the
responsibility of the technician to recognize this hazard
and use extreme care when performing service
procedures with the electrical power energized.
1. Verify LED on face of the phase monitor is green. If
LED is red, correct supply power fault.
2. Verify that the LED on the IGN is burning
continuously. If the LED is lit, go to Step 5.
3. Verify that the Digital Display on the mainboard is
displaying “–”. If the Digital Display is right, go to
Step 5.
4. If the LED is not lit, verify that 24 Vac is present
between R and C. If the LED is not lit and 24 Vac is
present replace the IGN. If the Digital Display is not
lit and 24 Vac is present replace the mainboard. If
24 Vac is not present, check fuse 2 on the
mainboard and check transformer (TNS1). Proceed
to Step 5 if necessary.
5. If no failures are indicated, use the TEST mode
procedures described in the “Unit Start-Up” section
or thermostat to start the unit. This procedure will
allow you to check all of the external controls
(relays, contactors, etc) and the IGN.
6. Test the system through all of the available modes,
and verify operation of all outputs, controls, and
modes. Refer to the sequence of operations for
each mode, to assist in verifying proper operation.
Make the necessary repairs and proceed to Step 6
and Step 7.
7. If no abnormal operating conditions appear in the
test mode, exit the test mode by turning the power
“Off” at the main power disconnect switch and
removing the test mode connections.
Failures
Heating Failure
Verify Heat Failure by Ignition Module (IGN) LED
indicator:
OFF: No Power or Failure
Continued ON: No Communication
Slow Flash: Normal, Heat Call
Fast Flash: Error Code:
1 Flash: System Lockout
2 Flash: Pressure Switch Fail
3 Flash: Primary Limit Open
4 Flash: Flame detected when gas valve is not open
5 Flash: Flame Rollout Open
6 Flash: W2 signal but no W1 signal
Simultaneous Heat and Cool Failure
Emergency Stop is activated.
To Clear an Alarm
Once the alarm has been identified and the cause has
been removed (for example, replaced faulty sensor),
the alarm can be cleared from the display.
Resetting Cooling and Heating
Lockouts
Cooling Failures and Heating Lockouts are reset in an
identical manner.
Method 1 section explains resetting the system from
the space; Method 2 section explains resetting the
system at the unit.
N No otte e:: Before resetting Cooling Failures and Heating
Lockouts check the Failure Status Diagnostics by
the methods previously explained. Diagnostics
will be lost when the power to the unit is
disconnected.
Method 1
To reset the system from the space, turn the “Mode”
selection switch at the thermostat to the “Off” position.