22
BOILER FAULTS
ERROR TYPE
(Warning,
Blocking,
Lockout)
DESCRIPTION
ERROR CODE
(OpenTherm)
HARDWARE (THERMISTORS, ACTUATORS)
B Flow thermistor open circuit (blocking) 1
B Flow thermistor short circuit (blocking) 2
B Return thermistor open circuit (blocking) 3
B / W Return thermistor short circuit (blocking) 4
B / W Flue thermistor open circuit (blocking) 5
B Flue thermistor short circuit (blocking) 6
W DHW thermistor open circuit 7
W DHW thermistor short circuit 8
W Outside thermistor defect (open / short) 9
B Water pressure sensor defect 10
L Flow thermistor open circuit (lockout after 24h) 11
L Flow thermistor short circuit (lockout after 24h) 12
L Return thermistor open circuit (lockout after 24h) 13
L Return thermistor short circuit (lockout after 24h) 14
L Flue thermistor open circuit (lockout after 24h) 15
L Flue thermistor short circuit (lockout after 24h) 16
L Heat thermistor open circuit (lockout after 24h) 17
L Heat thermistor short circuit (lockout after 24h) 18
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