Troubleshooting The 24 Vac Circuit: Non-Electronic Ignition - Frymaster 47 Series Service & Parts Manual

1.10.3 Troubleshooting the 24 VAC Circuit: Non-Electronic Ignition Units
(With Computer Controls)
Probable cause is Are there 24 volts
failed 24-volt
No AC on J3 Pin 8 (and
transformer. J1 Pin 8, if dual-
Probable cause is
Is continuity of drain
No
failed drain safety
safety switch(es) "0"?
switch.
Probable cause is
failed interface
47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
Either or both 24V
None
Is there 24 VAC on
Yes
vat)?
Probable cause is
Yes
Is there 24 VAC on
V1S (or V1D and
V2D, if dual-vat)?
Does unit have drain
Yes
safety switch(es)?
Is jumper in place between
Yes PWR and V1S (V1D and V2D,
board. if dual-vat), and is continuity
Probable cause is
Verify that drain
valve(s) are fully
closed, then turn
controller on.
Which LEDs are
lit?
LED and PWR
LED only.
the PWR Yes
terminal(s)?
No
failed interface
board.
Yes
No
No
No
"0"?
No
missing or failed
jumper.
1-38
GV LED (with or
without other
LEDs)
Are there 24 volts
AC on J3 Pin 9 (and
J1 Pin 9, if Dual-
vat)?
Yes
Is continuity of the
Yes
high-limit switch "0"?
No
Probable cause is
failed high-limit
switch.
24 VAC circuit is good.
Problem may be with gas
valve. Refer to Initial
Troubleshooting at the
beginning of this section.