57
TROUBLESHOOTING
10. TROUBLESHOOTING
A. LOCKOUT ERRORS
1. When a lockout error occurs the display will flash,
show which error occured and the wrench symbol.
2. Lockout codes require that the control be manually
reset either by holding the reset button on the display
or by pressing the reset button on the main control
board itself.
3. Lockout errors should be investigated further to
determine the cause of the by a qualified service
technician.
4. These error messages and some suggested actions are
listed in Table 10.1.
B. BLOCKING ERRORS
1. When a blocking error occurs the display will flash,
show which error occured and the wrench symbol.
2. Blocking errors will automatically clear if the condition
is corrected.
3. These error messages and some suggested actions are
listed in Table 10.2.
C. WARNING ERRORS
1. When a warning error occurs the boiler display will
“Atte” followed by a number code.
2. Warning errors will automatically clear once the
condition is corrected and will not prevent the boiler
from operating.
3. These error messages and some suggested actions are
listed in Table 10.3.
D. TYPICAL OPERATION CYCLE –
CENTRAL HEAT
1. Boiler is in standby. No demand. Central Heat
Radiator symbol is constant.
2. Demand is applied. Central Heat Radiator symbol
begins flashing.
3. Boiler pump and CH pump start.
4. Blower begins Pre-purge for 30 seconds at ignition
speed.
5. Spark engages 2 seconds.
6. Gas valve opens.
7. Spark remains engaged for 2 more seconds.
8. Two second flame proving period holds valve open
while control checks for flame signal.
9. Boiler holds at ignition speed for 10 seconds before
modulation begin.
10. Demand is met and removed.
11. Gas valve closes, Fan returns to ignition speed.
12. 10 second post purge period.
13. Pumps remain energized for pump post purge period.
14. Full unit standby.
E. TYPICAL OPERATION CYCLE – DHW
1. Boiler is in standby. No demand. Domestic Faucet
symbol is constant.
2. DHW demand is applied. Domestic Faucet symbol
begins flashing.
3. Boiler pump starts.
4. Blower begins Pre-purge for 30 seconds at ignition
speed.
5. Spark engages 2 seconds.
6. Gas valve opens.
7. Spark remains engaged for 2 more seconds.
8. Two second flame proving period holds valve open
while control checks for flame signal.
9. Boiler holds at ignition speed for 10 seconds before
modulation begin.
10. Demand is met and removed.
HIGH TEMPERATURE
LIMIT SUPPLY SENSOR
LWCO
PROBE
Figure 10.1: Additional Safety Locations
FLUE SENSOR
TEMPERATURE
SWITCH
RETURN SENSOR
CONDENSATE
FLOAT SWITCH
PRIMARY SAFETY
CONTROL
IGNITOR
BLOCKED VENT
SWITCH
AIR PROVING SWITCH
FLAME SENSOR
GAS VALVES
FLUE SENSOR
TEMPERATURE
SWITCH
RETURN SENSOR
CONDENSATE
FLOAT SWITCH
PRIMARY SAFETY
CONTROL
IGNITOR
BLOCKED VENT
SWITCH
AIR PROVING SWITCH
FLAME SENSOR
GAS VALVES
