Page 85
MagnaTech
BOILERS AND VOLUME WATER HEATERS
165
Block intake OFF
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.
172
Main relay feedback incorrect
L
Internal Fault.
1. Reset module.
2. If fault repeats, replace module.
174
Safety relay feedback incorrect
L
Internal Fault.
1. Reset module.
2. If fault repeats, replace module.
175
Safety relay open
L
Internal Fault.
1. Reset module.
2. If fault repeats, replace module.
176
Main relay ON at safe start check
L
Internal Fault.
1. Reset Module.
2. If fault repeats, replace module.
178
Safety relay ON at safe start check
L
Internal Fault.
1. Reset module.
2. If fault repeats, replace module.
184
Invalid BLOWER/ HSI output setting
L
1. Return to Configuration mode and recheck
selected parameters, reverify and reset
module.
2. If fault repeats, verify electrical grounding.
3. If fault repeats, replace module.
185
Invalid Delta T limit enable setting
L
1. Return to Configuration mode and recheck
selected parameters, reverify and reset
module.
2. If fault repeats, verify electrical grounding.
3. If fault repeats, replace module.
186
Invalid Delta T limit response setting
L
1. Return to Configuration mode and recheck
selected parameters, reverify and reset
module.
2. If fault repeats, verify electrical grounding.
3. If fault repeats, replace module.
Code Description
Procedure
187
Invalid DHW (Domestic Hot Water)
high limit enable setting
L
1. Return to Configuration mode and recheck
selected parameters, reverify and reset
module.
2. If fault repeats, verify electrical grounding.
3. If fault repeats, replace module.
