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F7 – OVP OR UVP ERROR
Cause of Error
Tools Required
Possible Broken Part
Troubleshooting
Procedures
Cause: When the supply voltage is lower than 135V or higher
than 275V, the inspection, circuit would detect over or under
voltage protection signal and send it to the outdoor unit
control panel and the outdoor unit control panel would initiate
an "OVP or UVP error" and indicate it through the internal
motor.
Inspection path: Supply voltage → Internal direct current
voltage → Reactor wiring → Module panel → Outdoor unit
control panel
Multimeter
Supply voltage, reactor, module panel and outdoor unit control
panel.
First, check the supply environment of the user,
1.
especially should check when the compressor of the
air conditioner has been running for a while. The normal
supply voltage should be between 198V and 242V and
the minimum work assurance range of the air
conditioner should be within 165V and 265V.
For the external machines with PFC panels (without
2.
separate rectifier bridges), the operator should ensure
if the PFC function is on with the direct current voltage
grade of the multimeter. When the compressor is
running, voltage between P and N ends detected on the
test module panel or outdoor unit control panel should
be over 200V and if the voltage is below that range, it is
possible that the reactor is faulted, or the PFC is broken.
3.
The operator should check and confirm the voltage
inspection circuit is on which control panel first and
then replace it. The regular replacement: for the
external machine of single panel single chip, replace the
external controller directly; and for the machine of two
panels, replace the module panel.
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