Service manual



. R&D, HOBART CHINA AMX/AM900 / 33
12.2CRITICALFAULTS
Onlythedrainprogramcanbestarted.Fillprogramandallwashprogramsarelocked.
INDICATOR  TheON/OFFbuttonilluminatesRED.
Rinse Wash lamp  FAULT PROGRAM.

F01


‐‐1
‐‐2


Temperatureprobe
BOOSTERB1
BoosterheatingRL10willbeswitchedoffimmediately.
Fillandwashprogramsarelocked,drainprogramcanbestarted.

 Possiblecause
1. ‐‐ 1= shortcircuit (temperature probeorwires
toprobe).
2. ‐‐2=opencircuit.

3. Inlettemperaturetolow.
Remedy
1. Checkwires,replacetemperatureprobe.

2. Replace wiring, replace temperature probe i
f

necessary.
3. Checkinlettemperature.

F02


‐‐1
‐‐2


Temperatureprobe
TankB2
TankheatingRL2willbeswitchedoffimmediately.
Fillandwashprogramsarelocked,drainprogramcanbestarted.

Possiblecause
1. ‐‐1=shortcircuit(temperatureprobeorwires
toprobe).
2. ‐‐2=opencircuit
Remedy
1. Checkwires,replacetemperatureprobe.

2. Replacewiring, replacetemperatureprobe if
necessary.

F03


‐‐1
‐‐2


Pressuretransmitter
BOOSTERB3
ControlofinputvoltageX14.7–min.0.3Vuptomax.4.0V.
Iftheinputvoltageisoutofrange,therunningprogramwillbestopped.
Fillandwashprogramsarelocked,drainprogramcanbestarted.

Possiblecause
1. ‐ ‐ 1 =  short circuit (transmitter or wires to
transmitter)/>4.0V.
2. ‐‐2=opencircuit/<0.3V.
Remedy
1. Checkwires,replacetransmitterB3.

2. Replacewiring,replaceB3ifnecessary

F04


‐‐1
‐‐2


Pressuretransmitter

TankB4
ControlofinputvoltageX14.10–min.0.3Vuptomax.4.0V.
Iftheinputvoltageisoutofrange,therunningprogramwillbestopped.
Fillandwashprogramsarelocked,drainprogramcanbestarted.

Possiblecause
1. ‐ ‐ 1 =  short circuit (transmitter or wires to
transmitter)/>4.0V.
2. ‐‐2=opencircuit/<0.3V.
Remedy
1. Checkwires,replacetransmitterB4.

2. Replacewiring,replaceB4ifnecessary.



‐‐3


Pressuretransmitter
TankB4
Softener
Themax.waterquantity[C82]isexceededandvalue[F16]isnotreached.Only
"draining"possible.
C82
F16

Possiblecause
1. Airtrapblockedorleaky.

2. Hosetopressuretransmitterleaky.
3. Valve Y 4.2 locked (drain direction) or coil
defective.
4. Extension board not correctly plugged to Main
PCB.
Remedy
1. Checkairtrap,cleanorreplaceifnecessary.

2. Replacehose.
3. Run Softener Test.
 Replace switching valve if
necessary.
4. Plugincorrectly.
Toquitthefault:startdrainprogramorreloadmachineprogramNo.(U01seepage23).

SIE



STRAINER
CONTROL
Reed‐switch[S4](X13.7)morethan5seconds"off".
Startoffillandwashprogramislockedautomatically.
S38
Possiblecause
1. Tank strainer is missing or not correctly
positioned.
2. Magnetatthestrainerismissing.
3. Reedswitchinwrongposition.
4. Cablebreak.
Remedy
1. Putstrainercorrectlyinplace.

2. Fitmagnet.
3. Putreedswitchincorrectposition.
4. Replacereedswitchandcable.