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F1 – MODULE PROTECTION ERROR
Cause of Error
Tools Required
Possible Broken Part
Troubleshooting
Procedures
Cause: The power module is the part to directly drive the
compressor to work. It can protect the machine in time when
overcurrent, overvoltage or overheat occurs and stops the
compressor from working. It will, at the same time, send a
"shutdown request" to the module panel. The error triggered by
the "shutdown request" is called "module protection error".
Inspection path: Supply voltage → Compressor wire, reactor
wire → System blocked → Module panel damaged → Outdoor
unit control panel destroyed → Compressor destroyed
Multimeter, pressure gauge, megameter, module panel
in normal condition
Supply voltage, compressor wire, reactor, system pressure,
module panel, outdoor unit control panel, compressor
1.
Check if the supply voltage unstable or volatile. High
system pressure will cause rotation problems to the
compressor.
2.
Is the module panel fixed to the radiator firmly? Is the
internal and external heat exchanger dirty? If "module
protection error" is indicated immediately after starting up,
observe if there is any component destroyed by a strike arc
near the module panel; use the multimeter to test if the
resistances between any two compressor wires are the
same. Use the megameter to measure if the resistance
insulation of the three compressor wires against the
ground wire is good (normally at MΩ level).
3.
Test if the 15V and 5V (3.3V) power supply on the module
panel is stable and exclude the module panel error caused
by power supply of the outdoor unit control panel.
4.
Replace with the module panel. If the test is normal after
changing the module panel, then the original module panel
is destroyed.
5.
If there is only electromagnetic sound and the compressor
does not work; or an irregular sound appears after the
compressor works for a while and then it shuts down; the
compressor may be blocked or destroyed. Consider
replacing the compressor.
10
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