46
Electric reheating A 63 Electric aer-heater failure - thermostat
Water heater
pump
A 65 Water heater pump failure - contact
Water heating ad-
ditional antifreeze
protection (PMO)
A 65 Electric heating additional PMO - thermostat
Inlet fan A 66 Backup inlet fan error - thermo-contact
Inlet fan (air-
flow failure)
A 66
1.) Backup inlet fan error - flow sensor
2.) Single-speed fan error - flow sensor
Outlet fan A 67 Backup outlet fan error - thermo-contact
Outlet fan (air-
flow failure)
A 67 Backup outlet fan error - flow sensor
Air flow sen-
sor (pressure)
- inlet fan
A 69 Unconnected or damaged air flow sensor (pressure) - inlet fan
Air flow sen-
sor (pressure)
- outlet fan
A 70 Unconnected or damaged air flow sensor (pressure) - outlet fan
Fan (inlet, outlet) A 71
1.) Communication error between control unit and the inlet/outlet fan frequency inverter
(Modbus data bus) - inverter internal error; wrong settings of the frequency inverter data
points – bus communication protocol, data transfer rate, parity, number of stop-bits, com-
munication timeout; poor connection of the bus cable to the frequency inverter terminals;
bus terminal resistance settings on the last frequency inverter has not been performed.
2.) Inlet/outlet fan error - thermo-contact
Fan (inlet, outlet)
– flow failure
A 72
1.) Lost communication between control unit and fan frequency inverter - inverter internal
error; wrong settings of the frequency inverter data points - bus communication protocol,
data transfer rate, parity, number of stop-bits, communication timeout; poor connection
of the bus cable to the frequency inverter terminals; bus resistance terminal settings on
the last frequency inverter has not been performed.
2.) Inlet/outlet fan error - flow sensor
Water pre-heating A 74
1.) Temperature sensor disconnected or damaged
2.) Water temperature in the water heat exchanger return pipe > 140 °C, or water tem-
perature in the water heat exchanger return pipe < 5 °C
Outlet tempera-
ture-dependent fire
alarm activation
A 81 Fire alarm triggered due to exceeded pre-set outlet air temperature (data point 820)
Inlet temperature-
dependent fire
alarm activation
A 81 Fire alarm triggered due to exceeded pre-set inlet air temperature is (data point 821)
Fire alarm (external
failure)
A 81
1.) Fire alarm triggered by the fire dampers - contact
2.) External failure - contact
Water heater re-
turn water
A 82
1.) Temperature sensor disconnected or damaged
2.) Water temperature in the water heat exchanger return pipe > 140 °C, or water tem-
perature in the water heat exchanger return pipe < 8 °C
List of Failures (HMI-SG controller) (continuation)
Failure
Description
Class
Failure
Number
Failure Causes
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