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Frymaster L.L.C., 8700 Line Avenue 71106, P.O. Box 51000, Shreveport, Louisiana 71135-1000
318-865-1711 FAX 318-862-2394
Printed in the United States Service Hotline
Page
15
1-800-24-FRYER
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:
• 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 - .9 VAC. Reading line voltage with the computer calling for heat, indicates a
failure of the computer to supply the necessary DC voltage to close the relay or a failure
of the relay.
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.
Output
Input
Output
Input
1
2
1
2
3
4
3
4
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.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
The pins in the computer plug are counted bottom to
top, left to right starting with the pin marked by a
protruding ridge.