Trane TR250 Service & Installation Manual page 55

TROUBLESHOOTING
Figure 28:
Code Fault
Bad Board or
Secondary Hig
Voltage Fault
bD
Bad Board
EE
Communicat-
ion Error
between
Control
CE
Module
and Display
Interface
Assembly
Igniter Failure
IO
Keypad Failure 1. Keypad is defective
Sb
Temperature
sensor input
SF
failure
Water
Temperature
Sensing Error
HS
Diagnosis Step
1. Verify that FC4 Fuse on
Fuse Board is not open.
2. Verify high voltage
output from Fuse Board.
3. Check for defective
Harness.
4. Check for defective
Transformer.
5. Fuse Board is defective Replace Fuse Board.
1. Defective Control
Module
1. Disconnect and then re-
connect power to heater.
2. Check for faulty wiring
or connection.
3. Control Module and/
or Display Interface
Assembly are defective.
1. Check for faulty wiring
or connection.
2. Igniter is defective
1. Check for faulty wiring
or connection.
2. Sensor is defective
1. Check remote
thermostat setting
2. Verify that the water
fl ow is adequate
3. Check inlet water
temperature sensor
Remedy
Remove FC from fuseholder. Mesure continuity across fuse.
If OK, reinstall fuse and proceed to step 2. If Fuse is open,
proceed to section titled ''Open FC4 Fuse''.
Disconnect plug from P6 connector of Fuse Board. Measure
for 120VAC across pins 3 and 5 of P6 receptacle on Fuse
Board. If OK, reconnect plug and proceed to step 3. If not
OK, go to step 4.
Disconnect plug from E10 connector of Contol Module.
Measure for 120VAC across pins 1 and 3 of Plug on Harness.
If OK, replace Control Module. If not OK, replace Harness.
Disconnect plug from P4 connector of Fuse Board. Measure
for 120VAC between pins 4 and 6 of plug from Transformer.
If OK, proceed to step 5. If not OK, replace Transformer.
Replace Control Module.
Inspect Display Interface Wiring. Ensure Display Interface
Plug is securely attached to Control Module. If OK, proceed
to step 2.
Replace Control Module and/or Display Interface Assembly.
Inspect Igniter wiring. Ensure Igniter Plug is securely attached
to Control Module. If OK, proceed to step 2.
Replace Ignitier.
Replace Display Interface Assembly.
Inspect sensor wiring. Ensure sensor is pluggd into back of
control module. If OK, proceed to step 2.
Replace temperature sensor.
Verify set point setting of remote thermostat is at or below
104°F. If set point of remote thermostat is OK, or if heater is
not confi gured for remote thermostat, proceed to step 2.
Verify that water fl ow to heater is above minimum required
(20 GPM for H150FD and H200FD, 25 GPM for H250FD
and H300FD, 30 GPM for H350FD and H400FD). Note that
intermittent periods of low water fl ow will cause this error. If
OK, proceed to step 3.
Compare the heater's temperature reading to the pool water
temperature with an accurate thermometer. If signifi cantly
different, replace inlet water temperature sensor.
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