SECTION 4

 

TROUBLESHOOTING

 

4.1 TROUBLESHOOTING PROCEDURES

 

 

 

 

 

 

PROBLEM

POSSIBLE CAUSES

SOLUTIONS

 

1. Aftercooler fan motor

Controller not set properly

Check the controller settings as outlined in Section 2.7. The

 

continues to operate,

 

controller may be set in the heat mode or the set points set too

 

system temperature

 

low. Set the controller to the recommended settings.

 

below 35OF.

 

 

 

 

Control relay faulty

Check the control relay. Replace if faulty.

 

 

 

 

 

2. Aftercooler fan motor

No power to the control box

Check main electrical power source.

 

not operating, system

 

 

 

temperature above

No power to the controller

Check the transformer. Make sure that the jumpers on the

 

45OF.

 

 

transformer are properly installed. Reference Section 2.5.

 

 

 

 

 

 

Check the fuses on the transformer.

 

 

Controller not set properly

Check the controller settings as outlined in Section 2.7. The

 

 

 

controller may be set in the heat mode or the set points set too

 

 

 

high. Set the controller to the recommended settings.

 

 

 

 

 

 

Controller failure

Check the controller settings. If the controller is properly set, check

 

 

 

the main power source.

 

 

 

Check the controller display for error codes. Section 4.2 outlines

 

 

 

what the error codes indicate and the necessary steps.

 

 

 

 

 

 

Sensor failure

If the sensor is faulty a "--" will be displayed for the temperature on the

 

 

 

controller display. Refer to Section 4.2 for further details. If the

 

 

 

sensor is faulty, it must be replaced.

 

 

 

 

 

 

Control relay faulty

Check the control power at the relay coil. Check the relay for proper

 

 

 

operation. Replace if faulty.

 

 

 

 

4.2 CONTROLLER ERROR CODES

The controller display panel is used to display error codes in the event of problems with the controller. The four error codes are listed below.

---SENSOR FAILURE

The "--" displayed for the temperature indicates that there is a problem with the sensor. The sensor is open or shorted. All relays will be de-energized in the event of a sensor failure. If the sensor is damaged, it must be replaced.

EE-EEPROM FAILURE

The "EE" error code indicates that there is a problem with EEPROM. The values read back from the EEPROM are not the same as what was written into the EEPROM. This error cannot be field repaired. The controller must be replaced.

-60°F or 270°F (-51°C or 132°C) Blinking - TEMPERATURE OUT OF RANGE

The temperature display blinks when the sensed temperature is outside of the display range, below -60°F (-51°C) or above 270°F (132°C). The displayed value remains at the display limit and the controller continues to function unless an open or shorted condition is detected.

BLINKING RELAY STATUS

This occurs when the Relay Minimum Off Time is active. The (ñ ) blinks while the relay's minimum off time is active.

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Honeywell AC-220-7, AC-140-7 manual Section Troubleshooting, Troubleshooting Procedures
Page 5 Page 7

AC-220-7, AC-140-7 specifications

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