Electronic Controls - Bunn H5X Service & Repair Manual

SERVICE

Electronic Controls

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co is
m p e q
ly u ip
w ith m e
A d th e
m in B u th e n t
a n is tr is
o f d th ild in g B a to
th e a to si c b e
FIG. 8a ELECTRONIC CONTROL e F rs O ff P lu in st
F o o o In te ic ia m b a lle
o d d S
a n e rv rn a ls in g d to
d D tio a n C o
ic e n a d C
ru g S a l, In o d d e
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A d c.
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is tr n M O C
a tio A )
a n
n (F u a
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).
Triac Assy
Electronic
Control Board
FIG. 8b ELECTRONIC CONTROL
BOARD AND TRIAC
Location:
The electronic control board is located inside the rear
of the dispenser (digital 5 gallon models). 3 & 5 gal-
lon Elements control boards are located in the front
shroud. Access will also be needed to the temperature
sensor, overflow tube temperature sensor, and liquid
level probe located on the tank lid.
General:
This system controls the liquid level and water tempera-
ture of the dispenser. These two functions act indepen-
dently of each other and should be tested separately.
Liquid Level Control Flow Charts
H5E, H5X LIQUID LEVEL CONTROL
H3/5/10 LIQUID LEVEL CONTROL
PROBLEM: Does Not Refill
Overflow Cup Full
Disconnect Level Probe
Voltage present at
Solenoid Valve
H 5
Unplug Ready Lamp
P4093.35
Voltage present at
Solenoid Valve
Replace Control Board
H5E, H5X LIQUID LEVEL CONTROL
H3/5/10 LIQUID LEVEL CONTROL
PROBLEM: Overflows
Unplug Ready Lamp
H 10
Disconnect Probe
Wire From Probe
Short Probe Wire
P1991-1.30
Disconnect Wire From
Replace Control Board
8
Yes
Remove Power
?
Drain cup
No
Retry
Yes
Does Water Flow
?
?
No
No
Replace Solenoid Valve
Yes
Replace Ready Lamp
?
No
Drain cup
Retry
No
Overflow
Replace Ready Lamp
?
Yes
Drain cup
To Chassis
Retry
No
Overflow
Replace Probe
?
Yes
Drain cup
Solenoid Valve
Retry
Yes
Overflow
Replace Solenoid Valve
?
No
Yes
Replace Probe