Component Test; Service Guide - International comfort products N80ESU Installation Instructions Manual

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LED CODES

STATUS

CONTINUOUS OFF

Check for 115VAC at L1 and L2, and 24VAC at SEC- -1 and SEC- -2.

HEARTBEAT

Control has 24VAC power.

Line voltage (115VAC) polarity reversed.

If status code recall is needed, briefly (2- -3 seconds) remove then reconnect one main limit wire to display stored status code. After status code

recall is completed test will occur.

EACH OF THE FOLLOWING STATUS CODES IS A SINGLE OR TWO DIGIT NUMBER WITH THE FIRST DIGIT DETERMINED BY THE

NUMBER OF SHORT FLASHES AND THE SECOND DIGIT AFTER THE PLUS (+) SIGN IS THE NUMBER OF LONG FLASHES.

LED ACTIVITY (CFH = Call for Heat)

Heartbeat

NO PREVIOUS CODE - - Stored status codes are erased automatically after 72 hours or as specified above.

1+2

BLOWER ON AFTER POWER UP (115VAC or 24VAC) - - Blower runs for 90 seconds, if unit is powered up during a call for heat (R- - W closed)

or (R- - W opens) during a blower on- - delay period.

LIMIT CIRCUIT LOCKOUT - - Lockout occurs if a limit, draft safeguard, burner thermal switch or blocked vent switch (if used) is open.

Control will auto- - reset after three hours. Check for:

- - Loose blower wheel

- - Dirty filter or restricted duct system

- - Inadequate combustion air supply (Burner thermal switch open)

6+1

IGNITION LOCKOUT - - Control will auto- - reset after three hours. Refer to status code #34.

GAS HEATING LOCKOUT - - Control will NOT auto- - reset. Check for:

- - Mis- - wired gas valve

- - 24VAC sensed at gas valve when should not be present

ABNORMAL FLAME - - PROVING SIGNAL - - Flame is provided while gas valve is de- - energized, inducer will run until fault is cleared. Check

for:

- - Leaky gas valve

PRESSURE > 0.15" w.c. AT START- - UP. Check for:

- - Obstruction in pressure tubing or Transducer vent holes

OFF

SECONDARY VOLTAGE FUSE IS OPEN. Check for:

- - Short circuit in secondary voltage (24VAC) wiring

2+5

INVALID MODEL SELECTION OR SETUP ERROR - - Indicated either the model plug is missing or incorrect. If code flashes 4 times on

power- - up control is defaulting to model selection stored in memory

PRESSURE TRANSDUCER INPUT DOES NOT SENSE TARGET PRESSURE OR PRESSURE IS OUT OF RANGE. Check for:

- - Excessive wind

- - Defective inducer motor

- - Low inlet gas pressure (if LGPS used)

- - Disconnected or obstructed pressure tubing

IGNITION PROVING FAILURE - - Control will try ignition four times before lockout #14 occurs. If flame signal lost during blower on- - delay

period, blower will come on for the selected blower off- - delay. Check for:

- - Oxide buildup on flame sensor (clean with fine steel wool)

- - Proper flame sense microamps (.5 microamps D.C. Min., 4.0 - - 6.0 nominal)

- - Manual valve shut- - off

- - Gas valve defective or turned off

- - Inadequate flame carryover or rough ignition

- - Green/Yellow wire MUST be connected to furnace sheet metal

4+2

INDUCER MOTOR FAULT the RPM pulses are not detected from the inducer motor within 20 seconds after a heat request, the inducer is

outside of its valid range of operation, or the inducer RPM signal was lost for 5 seconds during operation. Check for:

- - Proper vent sizing

- - Improper or loose motor wiring or bad connection

ON Solid CONTROL CIRCUITARY LOCKOUT Auto- - reset after one hour lockout due to:

- - Gas valve relay stuck open

Reset power to clear lockout. Replace control if status code repeats.

COMPONENT TEST

To initiate the component test sequence, shut OFF the room thermostat or disconnect the "R" thermostat lead. Briefly short the TEST/TWIN terminal to the

"C" terminal. Status LED will flash most recent code 4 times and then turn ON the inducer motor.

The inducer motor will run for the entire component test. The hot surface igniter, blower motor fan speed, blower motor- - heat speed, and blower motor- - cool

speed will be turned ON for 10- - 15 seconds each. Gas Valve and Humidifier will not be turned on.

LED CODES

STATUS

Heartbeat

Indicated the blower motor tested OK. Visual check of inducer motor and hot surface igniter required.

2+5

SETUP ERROR - - Reference code 25 on left

4+2

INDUCER MOTOR FAULT - - Indicates inducer motor failed test. Check inducer, wiring, furnace control and tubing for

poor connections

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