Troubleshooting
Fault Correction
No LED lights
Check for incoming voltage. The blue and brown wires are for power.
Check Power and alarm wires are not crossed. Note: Old COMBI #3004046 has opposite connectors.
Pump runs constantly
Check filter placement. The water filter should not touch the digital sensor.
Check the digital sensor for dirt, mold or debris. Clean with water.
Check all tubing connections and ensure they are firmly pressed on the connection barbs and secured
using cable ties. Check the entire drain line for clogs, kinks or the tube being pinched.
If the pump is running constantly and water is flowing from the end of the drain line then you need to
change the dip-switch power settings to increase the pump’s capacity. The system has too much water
or lift for the pump’s current power setting.
Pump will not run
If no LED lights, check for power at blue and brown wires.
If LED light is blinking green, the pump is on stand-by and waiting for water. Add water to sensor.
If LED light is blinking green and water is present in sensor, check sensor cable connection on both ends of
cable to be correctly inserted and clipped. Be sure not to force in connectors.
A/C unit is off
Check the pump LED status light. If it’s solid red (not blinking) AND the alarm wiring is connected pro-
perly, then the pump alarm relay is intentionally stopping the A/C unit from running. This prevents water
overflow and possible water damage. This is the correct function of a condensate pump alarm relay.
If the alarm wiring has been used, check the HRC alarm fuse for continuity using a multimeter and
replace it if necessary.
If the alarm wiring has been used, check that the pump is in Default Mode.
If the alarm wiring has been used and the wiring is correct, check the status LED; if it is OFF, with no LED
lights at all, then there is a fault either with the power main supply to the pump or with the pump itself.
During alarm status the pump itself will continue to run to decrease the water level even when the A/C
unit is not running. Once the water level is low enough, the pump will automatically reset the alarm
relay to re-connect power back to the A/C unit. Please note: Many outdoor A/C units have a 5 min. time
delay before they turn on the compressor and resume normal cooling operation.
Alarm is activated
If the alarm is activated (LED is solid red), the pump has too much incoming water for it to keep up.
Once the water level gets too high on the digital sensor it will trip the alarm relay and stop power to the
A/C system. (Only if the alarm wiring is used). The drain line could be blocked, kinked or pinched. You
may have incorrect capacity settings on the pump relative to the capacity of the A/C unit and or a high
lift vertical run.
Water is dripping
Check to ensure the alarm cable is correctly installed according to the appropriate wiring diagrams.
Please note: There are different diagrams according to different types of A/C systems.
If the alarm is not used and the drain line gets blocked, kinked or clogged, the pump can overflow. This
is why you should always use the alarm function.
Check all your hose connections. If you have a high head pressure (long vertical run), the water pressure
can blow a hose off its barb. This is why you should always use the factory supplied cable ties.
Pump is noisy
Check the filter placement. If the water filter is touching the digital sensor, the digital sensor may
believe it is water and activate the pump causing it to run dry when it should not be running at all.
Clean the digital sensor and the filter with water.
Configure pump capacity correctly according to the A/C capacity and lift rise and run of the drain line.
(See dip-switch settings in installation instructions).
Slurping or gurgling
Check for and correct a siphon in the drain line. (Review siphon specific instruction sheet). If the drain
line extends below the level of the pump, when the pump shuts down, the weight of the water remaining
in the drain line will create a siphon effect which will suck water away from the pump causing the pump
to start and run dry until reprimed with water. This can cause slurping and gurgling noises. Correctly
install your drain line to prevent a siphon from occurring.
LED lights flash
Immediately on initial power-up the pumps will always have a LED start sequence 5x and then go into
standby (blinking green). This is normal operation. This LED start sequence is the only indication
of whether the alarm is currently configured for Default Mode or Peripheral Mode. The alarm relay is user
configurable and can be changed back and forth. (See wiring diagram instructions).
3 red & 3 green
This is the pump reconfigure code. The pump is asking for help! If it has had 3 consecutive long run
LED flashes
cycles where it went from standby mode all the way into alarm mode, it is asking to be re-configured for
more power as its current dip-switch power settings are too low for the incoming water flow, lift or both.
Give it more power by reconfiguring the dip-switch settings. This reconfigure code will only appear after
3 consecutive long run cycles that went into alarm mode.
18
www.condensate-pumps.com / Combi Manual
July/Juillet 2019
BVM02520200217
