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26
Problem
Probable cause
Solution
Fans do not operate.
Electrical circuit problems.
Check the connections.
Internal circuit thermal cut-out activated.
Contact an approved Service Centre.
Fan surging
Duct network pressure too low.
Generate an additional pressure loss (refer to aeraulic
curves)
Reduced output in both
Heating and Cooling
mode
Compressor operating fault
Contact an approved Service Centre.
Low indoor air volume
Check filter, blower and duct.
Outdoor coil dirty
Clean the coil.
Insufficient refrigerant charge.
Add refrigerant charge.
Electric heater is not
operating.
No power supply.
Check the main fuse and the auxiliary fuses.
Heater circuit open (overheat)
Check the air volume or filter
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