Honeywell AQUASTATIC L7224 User Manual
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69-1957—1
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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.
Table 1. LED Error Codes
Error Code
Cause/Action
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.
Boiler Temperature
Text
Description
Display
Shows
bt
High Limit
HL
Low Limit
LL
High Limit Differential
Hdf
Low Limit Differential
Ldf
Local Thermostat Status
tt
Enviracom Thermostat Status
tte
Burner Status
brn
Circulator Status
cir
Zone Control
Zc
Zone Request
Zr
Error Code
err
Degrees Fahrenheit
f
Degrees Celsius
M22149
c
69-1957-1.fm Page 2 Tuesday, June 20, 2006 11:06 AM