Carrier G Series Heating Service Manual download pdf (Page 29)

3-2T--310

The Micromate (Figure 1-8) will allow t he user to

interface with the microprocessor based control from

the driver’s control panel. The Micromate Display

Panel (Figure 1-7) requires that the Micromate

Diagnostic Service Tool (P/N 76-62124-01) will need

to be used to access the system. The servicetool plugsin

to the Logic M odule to Driver Display Harness located

on the electrical control panel (Figure 1-1 1).

Table 3-2 Alarm Codes

ALARM

NO.

TITLE CAUSE REMEDY CONTROLLER

RESPONSE

A12 High Voltage The battery voltage is

greater than 32 volts.

Check, repair or re-

place alternator.

The s ystem is shut down

until the voltage returns

to normal levels.

A13 Low Voltage The battery voltage is

less than 17 volts.

Check, repair or re-

place wiring or alter-

nator.

The s ystem is shut down

until the voltage returns

to normal levels.

A14 Return Air Probe Failure Return air temperature

sensor failure or wir-

ing defective.

Ensure all connectors

are plugged in. Check

sensor resistance or

wiring. Refer to para-

graph 4.13. Replace

sensor or repair wir-

ing.

All outputs except the

evaporator fans will be

de-energized.

A15 Suction Pressure

Transducer Failure

Suction pressure

transducer failure or

wiring defective.

Ensure all connectors

are plugged in. Check

sensor voltage or wir-

ing. Replace sensor or

repair wiring.

Both unloaders are ener-

gized.

A16 Discharge Pressure

Transducer Failure

Discharge pressure

transducer failure or

wiring defective.

Ensure all connectors

are plugged in. Check

sensor voltage or wir-

ing. Replace sensor or

repair wiring.

One unloader is ener-

gized.

A17 Low Pressure Shutdown Low suction pressure

(below 10 psig)

Check cause of low

suction pressure. (Re-

fertosection3.4.3)

The clutch is de-ener-

gized for the minimum

off time. The evaporator

fans will remain running

during this period. After

the compressor cycles

off three times in 30

minutes all outputs will

be de-energized and the

system is locked out un-

til the power is cycled or

the alarm is reset.

A21 High Discharge Pressure High discharge pres-

sure switch open or

wiring defective.

Check discharge pres-

sure transducer read-

ing, wiring or cause of

high discharge pres-

sure. (Refer to section

3.4.3)

The clutch is de-ener-

gized for the minimum

off time. The condenser

and evaporator fans will

remain running during

this period. After the

compressor cycles off

three times in 30 min-

utes all outputs will be

de-energized and the

system is locked out un-

til the power is cycled or

the alarm is reset.

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Carrier G Series Heating Service Manual Page 29

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