If any of the following error codes E1, EL 01, 8.8, or 88 are displayed on your indoor unit, it means there's a communication issue between the indoor(s) and the outdoor unit.
During the initial start-up and system commissioning, if an error code is displayed, the first step is to verify that the connections on the indoor unit's terminal block (labeled 1, 2, 3, and G) match those on the outdoor unit's terminal block (also labeled 1, 2, 3, and G).
For example, if terminal 1 on the indoor unit is red, terminal 2 is black, terminal 3 is white, and terminal G is green, then the outdoor unit's terminal block should have the same color configuration: 1 is red, 2 is black, 3 is white, and G is green.
If the system has already been commissioned but is now showing an error code, turn off the unit at the breaker, wait for 2 minutes, and then turn it back on. If the error code still appears, follow these steps:
- Inspect the wiring connections between the indoor and outdoor units. Make sure the signal wires on terminals 1, 2, and 3 are properly connected to the corresponding terminals on the outdoor unit. If the wiring is correct, move on to step 2.
- Your mini-split system might need one of the following replacement parts: the indoor control board, the outdoor control board, or the reactor (on specific models). To determine the appropriate part, follow the steps provided below.
Use a multimeter to test the DC voltage between port 2 (or port S or L2) and port 3 (or port N or S) of the outdoor unit. Connect the red probe of the multimeter to port 2 (or S or L2), and the black probe to port 3 (or N or S).
During normal operation, the voltage will alternate between -25V and 25V.
An Outdoor PCB replacement is needed if the voltage alternates with only positive values.
An Indoor PCB replacement is needed if the voltage remains constant.
Testing the Reactor
Use a multimeter to test the resistance of the reactor that is not connected to the capacitor. The normal resistance value should be close to zero ohms.
If the resistance deviates from this, a Reactor replacement part is needed.
To order a replacement part or to get further assistance in diagnosing your unit, please contact one of our support representatives by submitting a ticket using the link below.
*Please note these procedures must be performed by a certified HVAC contractor.
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