resideo Honeywell Home Aquastat L7224A Notice D'installation page 11

L7224A,C; L7248A,C,L OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT
Aquastat
Error Code
Err1 Aquastat sensor fault; check water sensor.
Err2 ECOM fault; check EnviraCOM™ wiring.
Err3 Excessive electrical noise or frequency out of range. Hardware fault; replace controller. 18, 58
Err4 B1 fault; check B1 wiring/voltage.
Err5 Low Line; check L1-L2, 110 Vac.
a Warning: Fuse; check ECOM wires, replace fuse.
Err6
Err7 Warning: EEPROM, HL, LL, Hdf, Ldf; reset to default values.
b Repeated B1 fault (voltage present at B1 when output is turned off); check B1
Err 8
wiring/voltage.
a Warning: Outdoor Reset System failure; communication to Outdoor Reset Module lost,
Err9
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.
a Warning: Boost Failure; Boost Mode active at least once per cycle for the last 60
Err 10
consecutive cycles. Check Outdoor Reset curve settings.
a DHW Module/Sensor failure; communication to DHW Module lost, DHW Module
Err 11
failure, or temperature sensor failure. Check EnviraCOM wiring (1, 2, 3), check sensor
wiring.
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 oil burner is not drawing excessive current. Err 8 condition will keep repeating if B1 fault is not cleared.
System Diagnostic
Condition Condition
Boiler is cold, Display is OFF.
house is cold.
Display is ON.
Table 10. LED Error Codes.
Cause/Action
Table 11. Troubleshooting Guide
Check
120 Vac System power.
24 Vac T-T
24 V present; disconnect
thermostat, short T-T.
120 Vac at B1-B2
Refer to Err on display.
11
Action
Turn system power on.
No 24 V; replace control.
Boiler starts, check wiring and thermostat.
• If no, replace control.
• If yes, check burner and wiring.
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®
CONTROLLERS
EnviraCOM
Alarm
18
18
64
59
92
N/A
25
50, 53, 149
150
146, 147,
148
68-0281EFS—09