Installation / Operation Instruction Manual

Page 92
155 Purge fan switch OFF H or L 1. Purge fan switch is off when it should be on.
2. Check wiring and correct any errors.
3. Inspect the Purge Fan switch J6 terminal 3
and its connections. Make sure the switch
is working correctly and is not jumpered or
welded.
4. Reset and sequence the relay module.
5. If the fault persists, replace the relay module.
156 Combustion pressure and fl ame
ON
H or L 1. Check that fl ame is not present in the
combustion chamber. Correct any errors.
2. Make sure that the fl ame detector is wired to
the correct terminal.
3. Make sure the F & G wires are protected
from stray noise pickup.
4. Reset and sequence the module, if code
reappears, replace the fl ame detector.
5. Reset and sequence the module, if code
reappears, replace the module.
157 Combustion pressure and fl ame
OFF
L
158 Main valve ON L 1. Check Main Valve terminal wiring and
correct any errors.
2. Reset and sequence the module. If fault
persists, replace the module.
159 Main valve OFF L
160 Ignition ON L 1. Check Ignition terminal wiring and correct
any errors.
2. Reset and sequence the module. If fault
persists, replace the module.
161 Ignition OFF L
164 Block intake ON L 1. Check wiring and correct any errors.
2. Inspect the Block Intake Switch to make sure
it is working correctly.
3. Reset and sequence the module.
4. During Standby and Purge, measure the
voltage across the switch. Supply voltage
should be present. If not, the Block Intake
Switch is defective and needs replacing.
5. If the fault persists, replace the relay module.
165 Block intake OFF L
172 Main relay feedback incorrect L
Internal Fault.
1. Reset module.
2. If fault repeats, replace module.
174 Safety relay feedback incorrect L
175 Safety relay open L
176 Main relay ON at safe start check L
178 Safety relay ON at safe start
check
L
565 Control looking for outdoor
sensor
H Ensure Outdoor Sensor is properly connected.
981 Display not communicating with
control
Refer to wire diagram (7G) to ensure display
and control are wired properly.
Code Description Lockout
or Hold
Procedure
B RADFORD W HITE