Italtherm CITY CLASS 20 F, Service Manual

Page: 25 / 32

Green Heating Technology
25 SERVICE M
anual City Class F-FR
Errors
Code Error Find Description Suggestion
F FR E01
RESET
No flame ignition
(after 3 attempts)
• Gas pressure inlet lower than required
• Electrode position not correct
• PCB is not managing ignition
F FR E02
RESET
High Water Temperature on Primary
(Safety Thermostat)
• Safety Thermostat open; check water circulation and pressure
• Low Water circulation on the plant; check pump
F FR E03
RESET
Air pressure Switch is not working after
Fan = ON
• Check air pressure switch and fan probe
• Check flues pipes and chimney flues for eventual obstructions
F FR E05
SERVICE
CH NTC probe out of order
• CH Probe out of order; checF resistance values with standard ones
• Low Water circulation on the plant; check pump
F E06
SERVICE
DHW NTC probe out of order • DHW Probe out of order; checF resistance values with standard ones
F FR
E08
SERVICE
Flame lost 6 time after its detection
• Flues mixed with air inlet and combustion is not good anymore; checF
flues configuration
• Electrode position not correct
F FR E10
RESET
Low Plant Pressure • Fill-in water plant
F FR E11
RESET
Air pressure switch in working position while
FAN=OFF
• Check air pressure switch, its silicon pipes and fan probe
FR
E12
SERVICE
Tank probe out of order • Tank Probe out of order; check resistance values with standard ones
F FR E13
SERVICE
Gas Valve modulator coil not electrically
supplied
• Check gas valve wire connection
• PCB is not correctly managing gas valve; replace PCB
F FR
E17
SERVICE
Buttons Anomaly (if a button remains wrongly
pressed)
• Check keyboard buttons
F FR E22
SERVICE
Uncorrect microprocessor programming • Power OFf and Power ON for reset
F FR E23
SERVICE
Electric supply frequency not correct (correct
50 Hz +-1)
• Inlet electric supply not under specifications
F FR E31
SERVICE
Wrong communication between Boiler and
Remote Control
• Procedure to connect Remote control
• Connection wire shielded
F FR E35
RESET
Spurious Flame (Detection while no flame on
the burner)
• Electrode position not correct
F FR E38
SERVICE
External probe out of order • Check external probe resistance values with standard ones
F FR
E39
SERVICE
Antifreeze function activate • Check boiler and ice on the plant
F FR E42
RESET
System error (microprocessor internal error) • Turn OFF electricity and then ON; if error remains, replace PCB
F FR E44
SERVICE
Flow temperature increased sharply
•Low Water circulation on the plant; checF pump and water prevalence
on the plant
F FR E50
SERVICE
Electric supply Voltage not correct (under
175 V)
•Inlet electric supply not under specifications
F FR E72
SERVICE
Combustion configuration wrong
•The actual combustion control (flue gas thermostat or air pressure
switch)is incorrect compared to what is the configuration code of PCB
F FR