koppel KV 24CC-ARF21

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2.4.2.5. E5 malfunction(For single phase units)

Voltage protection

Check the voltage of

outdoor unit power supply,

whether the voltage

between L(1) and N is about

220~240VAC

Check the power supply

Check whether the voltage

range of P-N on IPM

module is normal? DC277-

356V for 24KBtu/h; DC277-

410V for 36K/48KBtu/h

Replace bridge rectifiers,

and then check whether the

system can run normally

Replace IPM board, and

then check whether the

system can run normally

Replace outdoor main board

Yes

Trouble is solved

Yes

E5 display

Replace the power board,

then check whether the

system can run normally

Yes

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koppel KV 24CC-ARF21 - Page 124