Frymaster 47 Series Service & Parts Manual page 41

1.10.2 Troubleshooting the 24 VAC Circuit: Electronic Ignition Units (cont.)
Probable cause is failed pilot
relay.
No
Is 24 VAC present on
J5 Pin 4 (and J1 Pin
4, if dual-vat)?
Yes
Probable cause is failed
Yes
interface board.
47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
Start here from preceeding
page.
Is/are PWR LED(s) lit?
No
Yes Is 24V LED lit?
No
Is 24 VAC present
on J4 Pin 4?
No
Probable cause is failed 24-
volt transformer.
Probable cause is failed
interface board.
Is 24 VAC present on
Yes J5 Pin 2 (and J1 Pin
2, if dual-vat)?
Yes
Is 24 VAC present on
J4 Pin 12 (and J2 Pin
3, if dual-vat)?
Yes
Is continuity of
high-limit
switch(es) "0"?
Yes
Is continuity on
drain safety
switch(es) "0"?
Yes
Is 24VAC present on
No pilot valve (PV) terminal
of the gas valve?
1-36
Probable cause is failed
ignition module. Check
No
module fuse before replacing
module.
Probable cause is failed
No
interface board.
Probable cause is failed high-
No
limit switch.
Probable cause is failed drain
No
safety switch.
Malfunctioning gas valve.
Refer to Initial
Yes
Troubleshooting at the
beginning of this section.