Honeywell L7224 Boiler User Manual


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69-1957—1 2
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 LimitHL
Low LimitLL
High Limit DifferentialHdf
Low Limit DifferentialLdf
Local Thermostat Statustt
Enviracom Thermostat Statustte
Burner Statusbrn
Circulator Statuscir
Zone ControlZc
Zone RequestZr
Error Codeerr
Degrees Fahrenheit
f
Degrees Celsius
M22149
c
69-1957-1.fm Page 2 Tuesday, June 20, 2006 11:06 AM
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