CONDITION
CAUSE
SOLUTION
Machine washes
EXTENDED WASH button .................
Push EXTENDED WASH button
constantly
was pushed. Extended wash LED on.
Extended wash LED goes out
Machine completes cycle.
Defective control circuit .......................
Contact service agent
Wash water
Incoming water temperature .................
Raise incoming temperature to:
temperature is low
at machine too low
140
°
F/60
°
C for UH-200B, UH-100B
40
°
F/22
°
C rise boosters
110
°
F/43
°
C for UH-200B, UH-100B
70
°
F/39
°
C rise boosters
180
°
F/82
°
C for UH-200, UH-100
140
°
F/60
°
C for UL-100 and (Drain
and refill water for UL-100)
Defective wash temperature probe .......
Check error codes, Section 5.3 and
5.4 and contact service agent
Defective or tripped wash tank .............
Contact service agent
high limit
Wash tank heater has lime build-up .....
Clean and/or delime machine
Defective wash tank heater ...................
Contact service agent
(Except UL-100)
Insufficient pumped
Clogged pump intake screen .................
Clean pump intake screen
spray pressure
Clogged spray arms ..............................
Clean spray arms
Scrap screen full of debris ....................
Must be kept clean and in place
Low water level in tank ........................
Check water level
Defective pump seal ..............................
Contact service agent
Worn spray arm bearings ......................
Replace bearings
Drain valve clogged or defective ..........
Contact service agent
Insufficient final rinse
Faulty pressure reducing valve (PRV) ..
Replace PRV
or no final rinse
Improper setting on PRV ......................
Correct flowing pressure setting is
(UH-200B, UH-200)
20-22 PSI [138-151 kPa]
Clogged rinse nozzle and/or arm ..........
Clean nozzles and/or spray arm
Clogged line strainer .............................
Clean screen or replace line strainer
Defective fill/rinse solenoid valve ........
Contact service agent
Fill hose (rear of machine) is kinked ....
Make sure hose has smooth bends
Water supply line too small ..................
Increase water supply line to 3/4" I.D.
Insufficient final rinse
Insufficient water supply pressure ........
Increase supply pressure at machine
or no final rinse
Correct supply pressure must
(UH-100B, UH-100, UL-100)
maintain minimum flowing pressure
25 PSI [151 kPa]
Clogged wash nozzles or spray arm .....
Clean nozzles and/or spray arm
Clogged screen in fill/rinse valve .........
Clean screen
Defective fill/rinse solenoid valve ........
Contact service agent
Fill hose (rear of machine) is kinked ....
Make sure hose has smooth bends
Clogged pump intake screen .................
Clean pump intake screen
Scrap screen full of debris ....................
Must be kept clean and in place
Low water level in tank ........................
Check water level
Defective pump seal ..............................
Contact service agent
Worn spray arm bearings ......................
Replace bearings
Water supply line too small ..................
Increase water supply line to 3/4" I.D.
Part 5:
OPERATOR TROUBLESHOOTING
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