WS D-71272 - Page 20

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Burner Control CBR
Fault displayed on CBR by flashing red LED and following fault Code:
Fault Display Fault / Cause Check / Resolution
F AA
Safety check delta-p air min.
Delta-p switch defective;
Flexible hose from pressure switch
(negative side) to the measuring orifice
lose or leaking;
Continuous air flow while burner is off →
check air switching valves
F A
P
Delta-p gas
(optional delta-p switch for gas signals
gas deficiency)
Delta-p switch defective; Gas flow
volume adjusted too low;
Threshold of delta-p switch selected too
low → lower setting;
Incorrect configuration of CBR
F 4
Delta-p air min.
(pre-adjusted to approx. half of delta-p
of nominal air flow volume)
Minimum required air volume not
achieved
Delta-p switch defective; Air volume flow
too low; Exhaust suction not present;
Flexible hose from pressure switch
(positive side) to the measuring orifice
lose or leaking;
Threshold of delta-p switch selected too
low → lower setting;
Flexible hoses switched;
High pressure air missing
F 5
Delta-p air 2 (optional) or .
Exhaust gas thermostat (optional)
E.g. Delta-p air max.:
Delta-p switch defective; Flexible hose
from pressure switch box (negative side)
to the measuring orifice lose or leaking;
Exhaust gas suction too high; Air flow
volume too high; Threshold of delta-p
switch selected too low → lower setting;
Exhaust gas temperature too high?
Thermostat defective or connection
defective?