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2U14CS1ERA-SM

Service diagnosis

Domestic Air Conditioner

˄A˅

YES

Yes

Check the status of LED1 on the

indoor mainboard. If the LED1

blinks interruptedly˛

If the voltage is of a constant

value of 0V DCto5V DC

YES

measure the voltage between Jumpers 3 and

4 of IC1 on the indoor mainboard with a

multimeter.

The outdoor mainboard is damaged;

Replace them with a new one.

If the LED1 is off within two minutes after the

machine is supplied with power, measure the

C voltage between positions 1 and 3 on the

terminal of outdoor unit with a multimeter.

If 230VAC is available but 310DC not,

the power module is damaged, replace i

with a new one.

Test the outdoor power supply (230VAC

and +310VDC) with a multimeter.

The outdoor mainboard is damaged; replace

it with a new one.

The indoor mainboard is damaged; replace

it with a new one.

If the value varies between 0 and 80 VAC, the

outdoor mainboard is damaged, replace it

with a new one.

If the value is constant at about 30V, the

indoor mainboard is damaged, replace it with

a new one.

If both 230VAC and 310DC are

available,measure +12V(from7805)

is available.

Haier 2U14CS1ERA User Manual

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