Bradford White Brute BNTH Installation And Operation Instructions Manual page 72

Page 68
149 Flame detected
150 Flame not
detected
154 Purge Fan
switch On
155 Purge fan switch
OFF
156 Combustion
pressure and
fl ame ON
157 Combustion
pressure and
fl ame OFF
158 Main valve ON
159 Main valve OFF
160 Ignition ON
161 Ignition OFF
164 Block intake ON
H or L Holds if fl ame detected during Safe Start check up to Flame Establishing
period.
H Sequence returns to standby and restarts sequence at the beginning of
Purge after the HF switch opens if fl ame detected during Safe Start check
up to Flame Establishing period.
H or L 1. Purge fan switch is on when it should be off.
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.
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.
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.
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.
L 1. Check Main Valve terminal wiring and correct any errors.
2. Reset and sequence the module. If fault persists, replace the module.
L 1. Check Main Valve terminal wiring and correct any errors.
2. Reset and sequence the module. If fault persists, replace the module.
L 1. Check Ignition terminal wiring and correct any errors.
2. Reset and sequence the module. If fault persists, replace the module.
L 1. Check Ignition terminal wiring and correct any errors.
2. Reset and sequence the module. If fault persists, replace the module.
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.
B W
RADFORD HITE