Display Status; Error Codes - Honeywell AQUASTATIC L7224 Series Technicianís Quick Reference Manual

L7224 SERIES
Pressing the I button again will display the LL (Low Limit) followed
by a three-digit number and the corresponding degree designator.
See the table below for an explanation of display readout.
After approximately 60 seconds without any key presses, the
display will enter a dim display mode. To return to the bright
display mode, simply press and release any key.
Text
bt
HL
LL
Hdf
Ldf
tt
tte
brn
cir
Zc
Zr
err
f
c
Error Code
Err1 Sensor fault; check sensor.
Err2 ECOM fault; check EnviraCOM. wiring.
Err3 Hardware fault; replace control.
Err4 B1 fault; check B1 wiring/voltage.
Err5 Low Line; Check L1-L2, 110 Vac.
Err6 Fuse; Check ECOM wires, Replace fuse.
Err7 EEPROM, HL, LL, Hdf, Ldf, Reset to default values.
Err8 Repeated B1 fault (voltage present at B1 when
output is turned off); check B1 wiring/voltage.
69-1957—1
Description
Boiler Temperature
High Limit
Low Limit
High Limit Differential
Low Limit Differential
Local Thermostat Status
Enviracom Thermostat Status
Burner Status
Circulator Status
Zone Control
Zone Request
Error Code
Degrees Fahrenheit
Degrees Celsius
Table 1. LED Error Codes
Cause/Action
2
Display
Shows
M22149