Operation, indication, diagnostics
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20051011
7.3 Error code list with operation via internal LED
Error code Clear text Possible cause
bAC Er3 Fault of compatibility program module to basic unit during
backup process
Program sequence of program module does not match the
basic unit
Err PrC Fault of program module – Error in data content of program module
– No program module fitted
Loc 2 No establishment of flame at the end of the safety time – Faulty or soiled fuel valves
– Faulty or soiled flame detector
– Poor adjustment of burner, no fuel
– Faulty ignition equipment
Loc 3 Air pressure faulty (air pressure switch welded in no-load po-
sition), decrease to specified time (air pressure switch) re-
sponse time)
Air pressure switch faulty
– Loss of air pressure signal after specified time
– Air pressure switch is welded in no-load position
Loc 4 Extraneous light Extraneous light when burner startup
Loc 5 Air pressure faulty, air pressure switch welded in working po-
sition
Time out air pressure switch
– Air pressure switch is welded in working position
Loc 6 Fault of actuator – Actuator faulty or blocked
– Faulty connection
– Wrong adjustment
Loc 7 Loss of flame Too many losses of flame during operation
(limitation of repetitions)
– Faulty or soiled fuel valves
– Faulty or soiled flame detector
– Poor adjustment of burner
Loc 8 --- Free
Loc 9 --- Free
Loc 10 Error not relatable (application), internal error Wiring error or internal error, output contacts, other faults
Loc 12 Valve proving Fuel valve 1 leak
Loc 13 Valve proving Fuel valve 2 leak
Loc 14 POC error Error valve closure control POC
Loc 20 Gas pressure switch min open Gas shortage
Loc 22 Safety loop open – Gas pressure switch-max open
– Safety limit thermostat cut out
Loc 60 Analog power source 4...20 mA, I < 4 mA Wire breakage
Loc: 83 Faulty PWM fan – PWM fan does not reach the target speed within the pre-
set period of time, or
– After reaching the target speed, the PWM fan leaves the
tolerance band again (P650) for a time exceeding the tol-
erance time speed deviation (P660)
Loc 138 Restore process successful Restore process successful
Loc 139 No program module detected No program module identified
Loc 167 Manual locking Manual locking
Loc: 206 AZL2... incompatible Use the latest version
Loc: 225 Faulty PWM fan – Fan speed dropped below the minimum prepurge PWM
(P675.00) after reaching the prepurge speed, or
– After reaching the ignition load speed, the maximum ig-
nition load PWM (P675.01) was exceeded
Loc: 226 Faulty PWM fan Parameterization error:
– Speed low-fire > speed high-fire, or
– Low-fire = 0 rpm, or
– Maximum speed = 0 rpm
Loc: 227 Faulty PWM fan One or several parameters violate the minimum/maximum
limit
rSt Er1 Error in compatibility program module to basic unit during re-
store process
Program sequence of program module does not
match the basic unit
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