39
Experts in heating
User Manual
Twin Bio
- PLV 09.13
13.
E
xa
m
ple eq
u
ip
m
ent fail
u
res and re
m
edies
13. Example equipment failures and remedies
Failure
Probable cause
Remedy
The display shows ‘burner sensor
short-circuit’ message
• Incorrect burner plate sensor
installation
• Burner plate outlet damage
• Burner duct damage
• Check sensor installation
• Check plate outlet
• Check burner duct
The display shows ‘heat exchanger
overheating’ or ‘STB open’ message
• Incorrect boiler temperature sensor
installation
• Boiler temperature sensor failure
• No heat removal
• Safety temperature limiter (STB)
failure
• Check correct sensor position
• Check the sensor connection in the
control
• Boiler pump failure
• Control replacement / repair
The display shows ‘burner overheating’
message
• Incorrect sensor installation
• Feeder sensor failure
• Fouled burner grate – sinter
on the grate
• Check sensor installation
• Replace feeder sensor
• Clean burner grate
No indications on the display
• No power supply
• Incorrect connection of control
system plugs and cables
• High control humidity
• Display failure
• Check power supply connections
• Check control plugs and connectors
• Control replacement / repair
Control system button(s) not working
• Control panel failure
• Control system repair
The feed screw does not turn, despite
being signalled as functioning
• No power to gear motor
• Wrong wiring of power cables
• The feeder is blocked
• Gear motor is faulty
• Control module is faulty
• Check control plugs and connectors
• Check the connection of the gear
motor to the screw shaft
• Check if the feeder duct is not
blocked and that the screw shaft can
rotate freely in the duct
No air intake despite the fan being
signalled as functioning
• No power to the fan
• Fan is faulty
• Control module is faulty
• Check fan plugs and cables
(with connectors)
• Replace fan
• Replace control module
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