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44
Table 7.3 BCB Hard Lockout (HLO) Codes
Code
Cause
Recommended Action
A1/A2
Excessive pressure differential (
∆
P) on water side of heat
exchanger
Check for scaling or blockage on water side of heat exchanger, also check pump
performance.
B03
Neutralizer/trap has little or no Condensate (water)
Fill neutralizer (or trap if not a factory neutralizer) with water to avoid flue gases
spilling into the room through a dry trap.
B04
Pressure at flue/condensate sensor is too low
Check flue gas vent connection or sensor connection located at condensate drain
line. Also check for a disconnected or open condensate drain line and last, look for
a leak in the heat exchanger outer casing (behind the insulation).
DW7
Temperature rise (
∆
T) through heat exchanger is too high
Appliance has been through multiple tests and checks including operating at a
reduced input to avoid this shut down. The
∆
P across the heat exchanger indicates
reduced water flow. Check the pump performance, check for partially closed valves
and if all ok, perform a descaling operation on the water side of the heat exchanger.
FL01
Flue gas temperature has exceeded the maximum safe level set
in the operating parameters
Flue gas temperature setting has been exceeded by a significant amount even
after operation at a reduced firing rate. Check entire burner assembly, if ok, then a
complete fire side cleaning must be initiated immediately.
FL05
Flue gas temperature too high
Unit is burning at a reduced BTU input rate. The cause of the high flue gas should
be investigated and corrected ASAP - See FL01
FL09
Fire side of heat exchanger is severely fouled
Remove burner and check condition of fire side of tubes in the burner area.
G01
Gas pressure too low
Find cause of low pressure and correct; piping or regulator sizing is the general
culprit
G03
Gas pressure too high during a burn cycle
Correct the cause of the high gas pressure - either adjust regulator or replace and
repair as required - maximum allowed by code is 14"w.c.
H15/H16
Water temperature limit set point exceeded
Check set point(s), sensors, pumping etc. Correct cause of high water temperature
H24
Water Temperature Manual Reset High Limit set point exceeded
Check set point(s), sensors, pumping etc. Correct cause of high water temperature
ID01
First INI process data missing
Run the Z-INI; starting Initialization numbers must be tested and the saved for all
connected sensors in a number of conditions.
ID02
EMB EEPROM fault (2)
Reset the fault, cycle power on and off, if the fault reappears, the EMB–EEPROM is
corrupted.
ID03
No valid data on microcontroller Flash memory
Reset the fault, cycle power on and off, if the fault reappears, the EMB–EEPROM is
corrupted.
ID04
Internal fault (gv1)
Reset the fault, cycle power on and off, if the fault reappears, the EMB–EEPROM is
corrupted.
ID05
Internal fault (gv2)
Reset the fault, cycle power on and off, if the fault reappears, the EMB–EEPROM is
corrupted.
ID06
Internal fault (gv3)
Reset the fault, cycle power on and off, if the fault reappears, the EMB–EEPROM is
corrupted.
ID09
Fan speed error
Cycle power off, check the four-wire fan connection; wires and each end at
connectors. If all ok, cycle power back on and if fan Speed error reappears, replace
fan.
ID12
Flue thermostat open.
Check for open flue temperature switch, if parameter S24=1
ID89
Fan is not running
Either fan is not running (check wiring or replace), or factory programming has
been altered (consult factory).
ID96
Wrong EEPROM key connected
Install proper EMB EEPROM, if it cannot be found, contact the factory for
assistance - be sure to have model and serial number of the appliance in question.
ID99
BDB Reset action finished
There have been too many resets, a concerted effort must be made to find the
cause of the fault and correct it. This is a timed action, and the unit cannot be reset
until the time has elapsed. Contact the factory with further questions. This fault will
require both a power reset and then an on-screen fault reset via the HISTORY tab.
ABH Hot™ Controls Hard Lockout Codes
Servicing - continued