Install Instructions

Page 71
NEOTHERM Residential Boilers
156 Combustion pressure and ame On H or L 1. Check that ame is not present in the combustion chamber.
Correct any errors.
2. Make sure that the 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 ame detector.
5. Reset and sequence the module, if code reappears, replace
the module.
157 Combustion pressure and ame Off L
158 Main valve On L 1. Check the 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 1. Check the main valve terminal wiring and correct any errors.
2. Reset and sequence the module. If fault persists, replace the
module.
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 1. Check the ignition terminal wiring and correct any errors.
2. Reset and sequence the module. If fault persists, replace the
module.
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