PROBLEM

PROBABLE CAUSES

CORRECTIVE ACTION

 

 

 

A. Failed 24V transformer.

A. If the wiring and connections be-

 

 

 

Check: LED 3 (24V) is not lit

tween the 24V transformer and

 

 

 

the interface board are intact, re-

 

 

 

continuously.

place the transformer.

 

 

 

B. Failed interface board.

 

 

 

 

Check 1:

LED 3 (24V) is lit

 

 

 

 

continuously, but 24 VAC is not

 

 

 

 

present on the right PWR terminal

 

 

 

 

(LED 4)

(and/or the left PWR

B. Replace the interface board.

 

24V circuit is

terminal (LED 2), if dual-vat).

 

 

Check 2:

 

 

 

 

suspect.

24VAC is present on

 

 

 

 

V1s (or V1D and V2D, if dual

 

NOTE:

All

voltage

vat).

 

 

measurements

must be

C. Open or failed drain safety switch.

 

made within 4 seconds

 

 

 

of the controller calling

Check: If 24VAC is present on

 

for heat. If the burners

C. Adjust or replace the drain safety

the gas valve main coil (PV ter-

do not

fire within 4

minal) (on both PV terminals, if

switch as appropriate.

seconds,

the

ignition

dual-vat),

check the connections

 

modules

will

lock out

 

and the continuity of the drain

 

and the controller must

 

be turned off and then

safety switch.

 

back on to reset them.

D. Failed high limit.

 

 

 

 

Check: If 24VAC is present on

D. If the high limit is open, replace.

 

 

 

the gas valve main coil (PV ter-

 

 

 

minal) (on both PV terminals, if

 

 

 

 

dual-vat), check the continuity of

 

 

 

 

the high limit.

 

 

 

 

E. Failed ignition module.

E. If the fuse in the ignition module

 

 

 

Check: 24VAC is not present on

 

 

 

is not blown, replace the ignition

 

 

 

V1S (or V1D and V2D, if dual

module.

 

 

 

vat).

 

 

Refer also to the diagrams of the 24 Volt Circuit on the following pages.

1-33

Page 39
Image 39
Frymaster H50 Series manual Problem Probable Causes Corrective Action

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