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NOTE: In many cases, a “hard lockout” will indicate that there is something wrong with the appliance, that should be serviced or repaired.
EXAMPLE:
If there is a loss of flow due to an air bubble passing through the appliance (sensed via the water pressure transducers), the appliance
will shut down and display a temporary fault of P04 or P05 A, B, or C. When flow resumes and a waiting time has elapsed, the control
board will perform a pre-start diagnostic and then resume a burn cycle.
To Turn Off Gas To The Appliance
1. Set the thermostat to lowest setting.
2. Turn off power switch on front of unit.
3. Turn off all electric power to the appliance if service is to be performed.
4. Turn gas shutoff valve clockwise to “off.” Handle will be horizontal. Do not force.
Pump & Wiring Control
The ABH HOT™ control board has an on-board relay for controlling the circulating pump. On a call for heat, the pump will start,
allowing the water flow proving circuit to be made and the pre-start diagnostic to continue. After the call for heat has been satisfied,
the pump will continue to run for the factory programmed period of time (1 minute) and then shut off. For water heating applications
an external temperature sensor must be mounted in the water storage tank. For heating applications, the call for heat must come
from an external source (room thermostat etc.).
IG2/IG3
Too many restarts or relights after no-flame.
Appliance has been through multiple tests and checks including trying to ignite
at different inputs to avoid this shut down. Combustion related items must be
checked, including air/gas ratio, ignition cable and igniter.
IG4/IG5
Too many restarts or relights after no-flame.
Appliance has been through multiple tests and checks including trying to ignite
at different inputs to avoid this shut down. Combustion related items must be
checked, including air/gas ratio, ignition cable and igniter.
IG19
Too many attempts for ignition
Appliance has been through multiple tests and checks including trying to ignite
at different inputs to avoid this shut down. Combustion related items must be
checked, including air/gas ratio, ignition cable and igniter.
IG27
Too many attempts for ignition
Appliance has been through multiple tests and checks including trying to ignite
at different inputs to avoid this shut down. Combustion related items must be
checked, including air/gas ratio, ignition cable and igniter.
P04
Low or no water flow
Check for pump electrical issues i.e. no power to the pump, pump motor is seized,
pump is constantly powered and running.
P05
Water flow too low through appliance
Check for partially closed valves, pump impeller fouling etc.
P06
Water flow blocked during a burn cycle (proof of flow)
Check for partially closed valves, pump impeller fouling etc.
W04
Minimum water pressure
Water pressure too low (within 10% of minimum pressure required), confirm
cause and correct.
To Turn Off Gas To The Appliance
1. Set the thermostat to lowest setting.
2. Turn off power switch on front of unit.
3. Turn off all electric power to the appliance if service is to be performed.
4. Turn gas shutoff valve clockwise to “off.” Handle will be horizontal. Do not force.
Servicing - continued
Table 7.3 BCB Hard Lockout (HLO) Codes - continued
Table 7.3 BCB Hard Lockout (HLO) Codes - continued
Code
Cause
Recommended Action