10 Diagnostic Tests for HLZ
10.1 Relays
The following tests are conducted with power applied.
Symptom: Air heater or plate heater will not heat.
Symptom: Air heater or plate heater over
heats. NOTE: Unit will display PROB if overheated. The probes are producing out of range resistance. Allow unit to cool before checking probes.
Tests:
4 |
|
| 4 |
2 |
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| 2 |
Input | Output | Input | Output |
1 |
|
| 1 |
3 |
|
| 3 |
Viewed from the front of the HLZ, the air heater relay is nearest the heater plate; the heater plate relay is nearest the front of the unit.
•With power supplied and computer turned on, measure DC voltage across input terminals of relay. With computer calling for heat ( dot illuminated on display), the reading should be approximately 12 VDC. Failure to measure DC voltage points to a problem with the computer or connection.
•With power supplied and computer turned on, measure AC voltage across output terminals of relay. With computer calling for heat (dot illuminated in display), the reading should be .6
10.2 Computer
Symptom: Faulty or no display.
Symptom: No response to buttons.
Tests:
Input power
•With the computer disconnected, check for 12VAC between pins 1 and 3.
3 6 9 12 15
2 5 8 11 14
1 4 7 10 13
The pins in the computer plug are counted bottom to top, left to right starting with the pin marked by a protruding ridge.
Frymaster L.L.C., 8700 Line Avenue 71106, P.O. Box 51000, Shreveport, Louisiana
Printed in the United States | Service Hotline | Page 15 |
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