| ID | fault | Possible cause |
| Exxx | sensor failure main line x | - X531 cable unplugged, broken cable, or poor contact between cable and DFM-61 flow measurement board?
- Temperature sensor defective?
- DFM-61 flow measurement board defective?
|
| Exxx | sensor failure return line x | - X540.x cable unplugged, broken cable, or poor contact between cable and DFM-61/ZFM-61 flow measurement board? (Circle 1.. 4 → DFM-61 and 5.. 8 → ZFM-61)
- Temperature sensor defective?
- DFM-61/ ZFM-61 flow measurement board defective? (Circle 1.. 4 → DFM-61 and 5.. 8 → ZFM-61)
|
| E9xx | sensor failure pressure BP 2 | - X532.1 cable unplugged, broken cable or poor contact between cable and DFM-61 flow measurement board?
- BP 1 pressure sensor defective?
- DFM-61 flow measurement board defective?
|
| Exxx | sensor failure pressure BP 4 | - X532.2 cable unplugged, broken cable or poor contact between cable and DFM-61 flow measurement board?
- BP 2 pressure sensor defective?
- DFM-61 flow measurement board defective?
|
| Exxx | Upper temperature deviation circle x | - Limit value (upper set/actual deviation) set too low?
- Control valve not opened enough?
|
| Exxx | Lower temperature deviation circle x | - Limit value (lower set/actual deviation) set too high?
- Control valve opened too much?
|
| Exxx | Return/main difference circle x | - flow rate too low?
- Limit value (Return/main difference) set too low?
- Control valve not opened enough?
- Heat transfer tool shape bad?
|
| Exxx | flow rate too big circle x | - Limit value (maximum flow rate) set too low?
- Control valve opened too much?
|
| Exxx | flow rate too low circle x | - circuit clogged?
- Limit value (minimal flow rate) set too high?
- Control valve not opened enough?
|
| Exxx | flow rate deviation above circle x | - Limit value (upper set/actual deviation) set too low?
- Control valve opened too much?
|
| Exxx | flow deviation below circle x | - circuit clogged?
- Limit value (lower set/actual deviation) set too low?
- Control valve not opened enough?
|
| Exxx | Flow-6 communication error | - Control cable plugged in?
- Control cable defective?
- DFM-61 flow measurement board defective?
- GAT-61/USR-61 control board defective?
|
| Exxx | overcurrent control valve RV 1.x | - M 10.x step motor defective (short circuit)?
- DFM-61/ZFM-61 flow measurement board defective? (Circle 1.. 4 → DFM-61 and 5.. 8 → ZFM-61)
|
| Exxx | RV 1.x undercurrent control valve | - Cable X540.x unplugged, broken cable or poor contact between cable and DFM-61/ZFM-61 flow measurement board defective? (Circle 1.. 4 → DFM-61 and 5.. 8 → ZFM-61)
- M 10.x step motor defective?
- DFM-61/ZFM-61 flow measurement board defective?
|
| Exxx | overcurrent shut-off valve AV 2, AV 3 | - M 11 or M 12 step motor defective (short circuit)?
- ZVB-61 extension board defective?
|
| Exxx | undercurrent shut-off valve AV 2, AV 3 | - X552/X553 cable unplugged, broken cable or poor contact between cable and ZVB-61 extension board defective?
- M 11 or M 12 step motor faulty?
- ZVB-61 extension board defective?
|
| Exxx | Valve not recognized | - YV 4/YV YV 5 11 magnetic coil defective?
- X551 cable defective?
- ZVB-61 extension board defective?
|