L7224U OIL ELECTRONIC AQUASTAT
®
CONTROLLER
9
69-1720—03
Table 7. LED Error Codes.
a
Warnings are generated to enunciate the system is not operating optimally, but the Aquastat is still operating and
maintaining boiler temperature. In the instance where an Outdoor Reset Module is used, the warnings may indicate a
reset curve setting error one or more features is not running optimally, and the Aquastat is reverting to default settings
or has stopped running the Outdoor Reset algorithms. The warnings are cleared when the issue(s) is resolved.
b
To clear Err 8 condition, depress and hold all three user keys simultaneously for 60 seconds. Err 8 condition clears
and display returns to normal. Err 8 condition is designed to catch welded relays on the Aquastat and will normally
only occur near end of life for the control. If Err 8 condition has occurred early in the controls life, be sure to check for
voltage feedback to B1 when B1 should be off and check current draw on b terminal to be sure burner is not drawing
excessive current. Err 8 condition will keep repeating if B1 fault is not cleared.
WARNING
Electrical Shock Hazard.
Can cause severe injury or death.
All circuits must have a common disconnect to
prevent the possibility of electrical shock.
Aquastat
Error
Code
Cause/Action
EnviraCOM
Alarm
Err1
Aquastat sensor fault; check water sensor.
18
Err2
ECOM fault; check EnviraCOM™ wiring.
18
Err3
Excessive electrical noise or frequency out of range. Hardware fault; replace controller.
18, 58
Err4
B1 fault; check B1 wiring/voltage.
64
Err5
Low Line; check L1-L2, 110 Vac.
59
Err6
a
Warning: Fuse; check ECOM wires, replace fuse.
92
Err7
Warning: EEPROM, HL, LL, Hdf, Ldf; reset to default values.
N/A
Err 8
b
Repeated B1 fault (voltage present at B1 when output is turned off); check B1 wiring/voltage. 25
Err9
a
Warning: Outdoor Reset System failure; communication to Outdoor Reset Module lost,
Outdoor Reset Module failure, multiple outdoor temperature sensors detected on the bus, or
outdoor temperature sensor failure. Check EnviraCOM wiring (1, 2, 3), check sensor wiring.
50, 53, 149
Err 10
a
Warning: Boost Failure; Boost Mode active at least once per cycle for the last 60 consecutive
cycles. Check Outdoor Reset curve settings.
150
Err 11
a
DHW Module/Sensor failure; communication to DHW Module lost, DHW Module failure, or
temperature sensor failure. Check EnviraCOM wiring (1, 2, 3), check sensor wiring.
146, 147,
148
