| Failure Description |
Failure Class |
Failure Numbe |
Failure Causes |
| Auxiliary Fan |
B |
15 |
1.) Communication error between control unit and the auxiliary 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, communication 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.) Auxiliary fan failure (Modbus data bus) - thermo-contact, flow sensor |
| Auxiliary Fan - twin |
B |
16 |
1.) Communication error between control unit and the auxiliary fan twin 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, communication 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.) Auxiliary fan twin failure (Modbus data bus) - thermo-contact, flow sensor |
| Backup fans in the inlet |
A,B |
18 |
B Class failure – main inlet fan failure (backup fan activated) - thermo-contact, flow sensor |
| |
|
|
A Class failure – inlet backup fan shutdown |
| Backup fans in the outlet |
A,B |
19 |
B Class failure - main outlet fan failure (backup fan activated) - thermo-contact, flow sensor |
| |
|
|
A Class failure – inlet backup fan shutdown |
| Communication, Modbus |
B |
23 |
Communication error between control unit and the fan or ROV 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, communication 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. |
| Process communication KNX |
B |
23 |
Communication error between control unit and HMI-SG controller (KNX bus) |
| Room unit 1 - Temperature |
B |
24 |
Disconnected or damaged HMI-SG1 controller |
| Room unit 2 - Temperature |
B |
24 |
1) Disconnected or damaged HMI-SG2 controller |
| |
|
|
2) Wrong HMI-SG2 controller communication address setting (the same address with the HMI-SG1 controller) |
| Outdoor temperature |
B |
25 |
Disconnected or damaged outdoor temperature sensor |
| Room temperature |
B |
26 |
Disconnected or damaged room temperature sensor |
| Outlet temperature |
B |
28 |
Disconnected or damaged outlet temperature sensor |
| Inlet temperature difference |
B |
32 |
Information message on the difference between inlet and required temperatures, providing the Inlet and Required Temperature Difference Monitoring has been activated (in the data point 201). If the temperature difference is higher than pre-set Maximum Difference (data point 801) or if the inlet temperature drops below the pre-set minimum threshold (data point 803), an information message is displayed. |
| Room temperature difference |
B |
33 |
Information message on the difference between room/outlet and required temperatures, providing the Inlet and Required Temperature Difference Monitoring has been activated (in the data point 201). If the temperature difference is higher than pre-set Maximum Difference (data point 807) or if the room/outlet temperature drops below the pre-set minimum threshold (data point 809), an information message is displayed. |
| Outdoor temperature dependent heat pump blocking |
B |
35 |
Information message – The heat pump blocked due to outdoor temperature |
| Heat pump |
B |
36 |
Heat pump failure – contact |
| Filters |
B |
39 |
Filter failure – contact |
| Fan operating hours |
B |
40 |
The pre-set fan operating hours have been exceeded; operating hours are set using the HMI-DM, TM or HMI@Web controllers |
| Cooling |
B |
41 |
Cooling failure (direct expansion evaporation, inverter condensing unit) - contact |
| ZZT (antifreeze protection) |
B |
42 |
1.) Lost communication between control unit and ROV 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 terminal resistance on the last frequency inverter has not been performed) |
| |
|
|
2.) Antifreeze protection ROV/DEV has been activated due to drop in temperature below the pre-set value (data point 516). |
| Inlet air relative humidity |
B |
46 |
1.) Inlet air humidity sensor disconnected or damaged |
| |
|
|
2.) Humidity > 100% |
| Outdoor air relative humidity |
B |
47 |
1.) Outdoor air humidity sensor disconnected or damaged |
| |
|
|
2.) Humidity > 100% |
| Room air relative humidit |
B |
48 |
1.) Outdoor air humidity sensor disconnected or damaged |
| |
|
|
2.) Humidity > 100% |
| Air quality (CO, CO2) |
B |
49 |
1.) Air quality sensor disconnected or damaged |
| |
|
|
2.) Air quality > 3000 ppm |
| Back draught protection (TH) |
B |
55 |
Back draught protection for the chamber after cooling – thermostat TH 167 or ES3M-T3. |
| Flue-gas high temperature, heater shut down |
B |
56 |
Flue-gas temperature sensor disconnected or damaged |
| Flue-gas high temperature, VZT (AHU) shut down |
A |
57 |
1.) Flue-gas temperature sensor disconnected or damaged |
| |
|
|
2.) Flue-gas temperature is higher than the pre-set temperature (data point 472). |
| Burner failure |
A |
58 |
Burner internal failure - contact |
| Electric pre-heating |
B |
59 |
1.) Electric pre-heater failure - thermostat |
| |
|
|
2.) Temperature behind the electric pre-heater < -50°C |
| Temperature in the inlet |
A |
60 |
11.) Inlet air sensor disconnected or damaged |
| |
|
|
2.) Inlet air temperature is higher than the pre-set temperature (data point 442) – water heating antifreeze protection (PMO) is active. |
| Heat exchanger freezing |
B |
61 |
Temperature sensor behind ROV (rotary heat exchanger) disconnected or damaged |
| Electric heating |
A |
62 |
Electric heater failure - thermostat |
| Electric reheating |
A |
63 |
Electric after-heater failure - thermostat |
| Water heater pump |
A |
65 |
Porucha čerpadla vodního ohřevu - kontakt |
| Water heating additional antifreeze protection (PMO) |
A |
65 |
Electric heating additional antifeeze protection (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 |
| 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, communication 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 - flow sensor |
| Fan (inlet, outlet) – flow failure |
A |
72 |
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, communication 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 - 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 temperature in the water heat exchanger return pipe < 5°C |
| Outlet temperature-dependent fire alarm activation |
A |
81 |
Fire alarm triggered due to exceeded pre-set outlet air temperature (data point 820) |
| Outlet temperature-dependent fire alarm activation |
A |
81 |
Fire alarm triggered due to exceeded pre-set inlet air temperature is (data point 821) |
| Inlet temperature-dependent fire alarm activation |
A |
81 |
1.) Fire alarm triggered by the fire dampers - contact |
| |
|
|
2.) External failure - contact |
| Water heater return water |
A |
82 |
1.) Temperature sensor disconnected or damaged |
| |
|
|
2.) Water temperature in the water heat exchanger return pipe > 140°C, or water temperature in the water heat exchanger return pipe < 8°C |
