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this fault occurs 3 times within 90 minutes, the compressor

will be locked out and manual reset will be required. To re-

set, interrupt power to the control board. The possible causes

are:

1. High-pressure switch open. The high pressure switch is

wired in series with the control relay that energizes the

safety circuit. If the high-pressure switch opens during

compressor operation, the compressor stops, and the stop

is detected by the control board. The high pressure switch

will not lock out during the ﬁrst 5 minutes of operation.

2. Low-pressure switch open. The low pressure switch is wired

in series with the control relay that energizes the safety

circuit. If the low-pressure switch opens during compres-

sor operation, the compressor stops, and the stop is de-

tected by the control board. The board ignores the low

pressure switch during the ﬁrst 5 minutes of operation to

prevent nuisance stops if low ambient operation is

required.

3. Internal compressor protector open. The internal com-

pressor protector is used on 06D model compressor. The

internal protector switch is wired in series with the con-

trol relay that energizes the safety circuit. If the internal

protector switch opens during compressor operation, the

compressor stops, and the stop is detected by the control

board.

4. Freeze protection thermostat open. The freeze protection

thermostat switch is wired in series with the control relay

that energizes the safety circuit. If the freeze protection

thermostat switch opens during compressor operation, the

compressor stops, and the stop is detected by the control

board.

5. Wiring error. A wiring error in the control safety circuit

will cause the modules to malfunction, and an error will

be indicated.

Start the compressor. If the compressor starts, verify that

all stages of condenser fans are operational. Observe com-

pressor operation to verify that compressor is working and

condenser fans are energized after compressor starts.

ALARM CODE HF_15 (Thermostat Failure) — This alarm

does not apply to a unit conﬁgured for and connected to a

space thermistor. If the thermostat is calling for heating and

cooling at the same time, the unit will operate on a ‘‘ﬁrst

come ﬁrst served’’ basis and an alarm will be generated. An

alarm will also generate if stage 2 heating or cooling is called

for before stage 1. Reset of this alarm is automatic once the

problem is corrected. The cause of the alarm is usually a bad

thermostat, a wiring error, or a loose connection.

ALARM CODE HF_16 (Control Board Failure) — This alarm

is generated with a faulty module. All outputs are turned off.

The module must be replaced.

If the analog to digital converter fails, the control board

will appear to operate correctly, however all set points will

revert back to default values in the event of a power failure.

The module must be replaced.

ALARM CODE HF_17 (Expansion I/O Board Failure) —

This alarm is generated with a faulty module. If this is a

result of an analog to digital conversion, all outputs are turned

off and the unit shuts down. If this is a result of the non-

volatile RAM unable to read the set points, it will appear to

operate normally, however, in the event of a power failure,

the device will operate to the default values upon resump-

tion of power. The module must be replaced.

ALARM CODE HF_18 (Timeclock Failure) — This alarm

is not used with CV units conﬁgured for and connected to a

thermostat. The alarm is generated when clock data is out of

range, or if the time does not advance. All outputs are turned

off. Reset is automatic.

ALARM CODE SE_05 (Loss of Communications with Ex-

pansion Board) — If communication is lost with the expan-

sion board all algorithms involving the expansion board will

be bypassed, and an alarm will be generated. This alarm will

reset automatically when the communication is restored.

The outputs will turn on normally after the alarm condition

has been reset. The probable cause for this condition is a

faulty or improperly connected plug, a wiring error, or a faulty

module.

ALARM CODE SE_14 (Indoor-Air Quality Sensor Failure)

— This alarm is valid only when the expansion board is used,

the IAQ alarm option is enabled, and the unit is equipped

with ﬁeld-supplied IAQ sensors. The alarm is generated when

the IAQ sensor is reading less than one volt. The reset method

is automatic and the alarm is cleared when the sensor reads

at least 1.5 volts.

ALARM CODE SE_15 (Linkage Failure — DAV System

Only) — A linkage failure alarm is generated when the link-

age has stopped updating the TSM linkage tables within the

last 5 minutes.

NOTE: This alarm can only be generated after linkage has

updated the table at least one time since initialization.

The unit controls enter the linkage default mode if the link-

age is enabled, but the communications link has been lost.

With the controls having reverted back to stand-alone op-

eration, the existing sensors, previously overridden by link-

age, will be used. This may be caused by a loose connection

or a broken wire. Reset of this alarm is automatic once the

problem is corrected.

ALARM CODES SE_16 to SH_19 (Fire Shutdown, Smoke

Purge, Evacuation, Pressurization) — When the unit is equipped

with an optional smoke control and a ﬁre system is installed,

these 4 modes are provided to control smoke within areas

serviced by the unit. The unit must be equipped with an econo-

mizer, power exhaust, and the expansion module to support

these modes. The building ﬁre alarm system closes ﬁeld sup-

plied, normally open, dry contacts connected to the expan-

sion module to activate the alarms. Reset of this alarm is

automatic once the problem is corrected.

ALARM CODE SE_20 (Outdoor-Air Quality Sensor Fail-

ure) — This alarm is valid only when the expansion board

is used, the OAQ alarm option is enabled, and the unit is

equipped with ﬁeld-supplied OAQ sensors. The alarm is gen-

erated when the OAQ sensor is reading less than one volt.

The reset method is automatic and the alarm is cleared when

the sensor reads at least 1.5 volts.

ALARM CODE SE_21 (Supply-Air Thermistor Reset Fail-

ure) — This alarm is valid only when enabled. This alarm is

generated when the supply-air temperature sensor is reading

less than one volt. The reset method is automatic and the

alarm is cleared when the sensor reads at least 1.0 volts. The

cause of the alarm is usually a bad thermistor, a wiring error,

or a loose connection.

ALARM CODE SE_22 (STO Sensor Failure) — This alarm

is valid only when enabled. This alarm is generated when

the STO sensor is open or shorted for greater than 5 seconds.

Reset of this alarm is automatic once the problem is cor-

rected. The cause of the alarm is usually a bad thermistor, a

wiring error, or a loose connection.

DATA STORAGE ERRORS — The control will also detect

data storage failures in Non-Volatile RAM, and generate Stor-

age Failure (SF) alarms as they occur. When storage failure

occurs, the following logic will take place. If ‘‘good’’ value

of the failed conﬁguration/service parameter is available in

RAM, it will be used until the next power-up, at which time

the parameter will be loaded with its default value. In case

of a Storage Failure occurring before RAM has been up-

dated, the default value will be loaded immediately. The stor-

age failure alarms will be enunciated on CCN only. The alarm

light or LED blinks are not used. Table 61 shows a complete

list of storage failure codes.

A controls troubleshooting table is provided for use in ser-

vicing the unit. See Table 62.

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 43 44

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