Troubleshooting
| SYMPTOM | POSSIBLE CAUSE(S) | CURE |
|---|---|---|
| No light in the display and no LCD-display and LED lamps activated | No power to the unit or the wrong voltage | Measure the power on MAIN input terminals |
| Check the Fuse 2AT inside LLC-D3 controller | ||
| Wrong digits/figures in display | Interference caused by strong disturbance or else | Push the small RESET button next to the coax-connector on the circuit board |
| Blinking message in display **MEASUREMENT IS NOT CORRECT** | Loose coax-connector, defective coax cable, internal probe leakage | Check probe connection if loose or not |
| Check probe resistance between and + of the probe-connector with a megger: resistance should be infinite (!) for a normal probe | ||
| Check resistance between the - of the coax-connector (shaft of the connector) and the mass of the probe (metal probe-head or ¾ thread): as these are connected this resistance should be almost zero | ||
| If possible measure the capacitance of the probe and report values to Bosma-Controls | ||
| If capacitance is 0, it is possible that the coax-connector got loose from the cable | ||
| The valve or the pump do not react to the signal from the controller | Defective cable or lack of a connection to the valve or pump | Check the connection to the pump or the valve |
| The LCD-display bar shows too low/high level in relation to the actual level in the vessel | The cable is defective or no connection to the sensor probe | Measure the signal from the sensor |
| Calibration is not correct | Calibrate the controller ZERO and FULL | |
| Sensor not calibrated for the correct refrigerant | Check the sensor. Look at the sensors instruction manual | |
| Deposit/Oil under in standpipe | ||
| High/low alarm occurs frequently | Turbulence in liquid | Check the operational state, when "boiling" occurs insulating the standpipe can help |
| Actual level is continuous fluctuating +/- around switchsetting point. with a LLC-D3 HYSTERESIS value set on low(est) value | Check the HYSTERESIS value and set this on "2" or set a higher value | |
| Eventually set the AVERAGE value at a higher value | ||
| The LCD-display flickers or is unstable | Loose connection in the power supply or the sensor | Check for loose connections |
| EMC interference from mobile telephones, frequency converters, or other equipment that does not meet the legal requirements for EMC | Check equipment that is causing interference | |
| Install insulated wire from the sensor-housing to the controller-earth |