Carrier MMY-MAP0724FT9UL Service Manual page 151

Multi type super heat recovery multi-i

Table of Contents

Check code

Main

Outdoor 7-segment display

remote

Check

Sub-code

controller

code

P20

—

∗

: IGBT circuit

∗

: Position

detection

circuit error

∗

: Motor lockup

error

∗

: Motor current

detection

∗

: TH sensor

temperature

error

∗

: TH sensor

error

∗

: Inverter DC

voltage error

(outdoor fan)

Note:

Although

letters 0 to F

appear at

P22

locations

indicated by

∗

", please

ignore them.

Location

Description

detection

I/F

Activation of

high-pressure

protection

IPDU

Outdoor fan

IPDU error

Error detection

System

condition(s)

status

All stop

Pd sensor detects pressure

equal to or greater than

3.6MPa.

∗

All stop

(Sub code: 0

)

Fan IPDU overcurrent

protective circuit

A status that the current flows

over the fixed amount when the

fan was activated was detected.

∗

All stop

(Sub code: 1

)

Fan IPDU position detective

circuit

The position detection was not

normally performed.

∗

All stop

(Sub code: 3

)

External elements by gust,

obstacles, etc.

Velocity estimate was not

correctly performed.

∗

All stop

(Sub code: 4

)

Fan IPDU overcurrent

protective circuit

A status that the current flows

over the fixed amount when the

fan operated was detected.

∗

All stop

(Sub code: C

)

Temperature of TH sensor over

the fixed value was detected

during operation of the fan.

∗

All stop

(Sub code: D

)

The resistance value of the

sensor is infinite.

Or 0 (at Open / Short)

∗

All stop

(Sub code: E

)

Protection for fan IPDU DC

voltage

DC voltage detected over the

fixed value or below the fixed

value.

– 151 –

Check items (locations)

• Check for defect in Pd pressure sensor.

• Check service valves (discharge gas

side, suction gas side, liquid side) to

confirm full opening.

• Check for defect in outdoor fan.

• Check for defect in outdoor fan motor.

• Check outdoor PMVs (PMV1, 2, 4) for

clogging.

• Check indoor/outdoor heat exchangers

for clogging.

• Check for short-circuiting of outdoor

suction/discharge air flows.

• Check SV2 circuit for clogging.

• Check 4-way valve operation error.

• Check for defect in outdoor P.C. board

(I/F).

• Check for defect in indoor fan system

(possible cause of air flow reduction).

• Check opening status of indoor PMV.

• Check indoor-outdoor communication

line for wiring error.

• Check for faulty operation of check valve

in discharge pipe convergent section.

• Check gas balancing SV4 valve circuit.

• Check mispiping of suction gas/

discharge gas main pipes.

• Check discharge gas pipe checked

valve operation error.

• Check SV11 valve circuit.

(Clogging, OFF at one side only)

• Check clogging of circuit at sub heat

exchanger liquid side.

(Miswiring, disconnection, wiring

forgotten)

• Check Cool/Heat FS unit.

Clogging of SVD valve, operation error

check

Wiring check in FS unit

(SVD/SVS coil miswiring, etc.)

Wiring check between FS unit and

inside of room

(Miswiring, disconnection, wiring

forgotten)

• Check SV5 valve circuit.

• Check for refrigerant overcharging.

• Fan motor check