TROUBLE SHOOTING For coin operated machines( pink or green cam timer) |
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| MALFUNCTION | Probable Cause(s) | How to Check | How to Cure |
| Loss of power on phase | Check voltage on the three phases separately with test light or voltmeter | Check where power is lost and repair | |
| Safety fuse 4 A blown | Check power before and after safety fuse | Replace fuse | |
| Coin jammed in coin meter | Push button on coin meter : Coin will be rejected |
Insert same or new coin again | |
| Malfunction of coin meter microswitch | Check with voltmeter | Replace coin meter microswitch | |
| Coil of contractor R1 interrupted and contact 3(4) R1 fails
to shut |
Check coil with ohmmeter | Replace coil or contactor as necessary | |
| Contact 23(17) of timer fails to shut |
Check if contact is closed when coins or tokens are inserted | Repair contact or replace timer | |
| Contact 21(19) of timer fails to shut |
As soon as micromotor M1 is under current, contact 21(19) Must shut. .check with ohmmeter |
Repair contact or replace timer | |
| Door open or not completely shut and microswitch S of door interlock devise can not work | Pull door handle | Close door carefully | |
| Door switch defective | Check with ohm- or voltmeter | Replace door switch | |
| Micromotor M! of the timer interrupted | Check with ohmmeter | Replace micromotor M1 or timer as necessary | |
| 2. After inserting coins or token, machine starts but pilot-light doesn’t switch on | Pilot-light defective | Check with ohmmeter or test lamp | Replace pilot-light |
| 3. After inserting coins or token, there is power on the machine but cycle fails to start and no power | Acceleration button is neither closed or open - on intermediate position | Check with ohmmeter : switch must be closed | Replace acceleration button (switch) |
| Contact 8 2 of timer is open | Check defective contact in timer | Repair contact or replace timer | |
| No button or wash selector switch is pushed | Check button on facial panel | Push button corresponding to selected program | |
| Water level control switch low level is defective, contact 11 Is not closed 12 Or wire to water level control switch is interrupted |
Check with ohmmeter if contact 11 is closed when there is no 12 water in tub |
Water level control switch has to be replaced or wire replaced or connection with tub cleaned |
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| 4. After inserting coins or token, machine starts but fuse of control circuit blows immediately | Cold water inlet valve I - 1 or hot water inlet valve I - 4 short circuited | Remove wires from solenoids of the valves and switch power on again. If fuses don’t blow anymore , one of the solenoids must be defective | Replace defective solenoids of cold water inlet valve I - 1 or hot water inlet valve I - 4 |
| Motor of drain valve short circuited | Remove wire from motor | Replace drain valve | |
| Reversing switch of motor short circuited | Check if there is no internal short circuit or if micromotor M3 is not short circuited | Replace reversing switch of motor or micromotor M3 as necessary | |
| Short circuit in wash-winding of motor | Remove wires to wash-winding of motor. If there is no short circuit any more, motor must be defective | Replace completer motor as both windings(Wash and spin) are built in the same motor. | |
| Contactor R2(wash) short circuited | Check if solenoid A1 A2 of contactor R2 is short circuited |
Replace solenoid other contactor | |
| Short circuit in wiring harness or on terminals of contactor R2 | Proceed systematically and try to defect fault by elimination | Insulate short circuit or replace part of wiring harness as necessary | |
| 5. Door not interlocked when coin is inserted | Door interlock assembly not correctly adjusted (mechanically) | Check if door can be opened when machine is under current | Pin of interlock device is not down and doesn’t hook in door handle. Adjust correctly |
| Coil R4 is not activated | Coil R4 is interrupted or core can not be attracted. Replace defective parts. | ||
| Door switch S not set correctly | If machine stops when you pull door handle during operation | Set door switch correctly by stretching spring in the cup nut | |
| 6. Cycle fails to advance, stays in
one phase of operation NOTE
This fault is frequent after acceleration button has been used. To push
once more mostly solves the problem: |
Micromotor of timer M1 not running | Try to advance timer by pushing acceleration button | If impossible, replace timer or micromotor as necessary |
| Micromotor of sender M2 not running | Advance timer to e.g. last spin by pushing the acceleration
button. If machine goes on spinning, micromotot of timer must be defective,
because contact 13(11)can not close anymore |
Replace timer or micromotor | |
| Step of 30” or 2’ of timer is defective | Check contact 13 15 11 9 And a b |
Replace timer | |
| 7. Cycle fails to advance at one stage of the cycle | Drain valve remains open and timer waits for correct water level. If water enters into the machines and flows away immediately again via the open drain valve, the requested water level will never be obtained and timer will not advance anymore | where the drain valve must be closed, check if machine is draining | hinder closing of valve Motor defective : Replace |
| Motor of drain valve receives no power | Contact drain in timer 27 29 Doesn’t shut. Check voltmeter |
Replace timer or repair defective contact | |
| Contactor R1 31(32) defective |
Replace or repair contactor or replace bridge | ||
| 8. Machine will not stop at the end of cycle but continues on into a new cycle | Timer defective : contacts 19-21 and 17-23 are short circuited | Check if on step 52 contact 19-21 is open or not | Replace timer or repair contact. As both contacts are on the same cam, this malfunction is rather rare |
| Microswitch level fails to open owing to coin | Coin jammed in coin meter | Remove coin | |
| Microswitch short circuited | Disconnect wire from coin meter and short circuit to start cycle | If machine stops, replace microswitch | |
| 9. Machine will not fill | Drain valve remains open | If water is coming in but machine has not filled after a reasonable length of time, drain valve probably remains open | Clean drain valve and remove dirts or foreign piece Contact 27-29 timer defective replace timer |
| If it occurs during prewash water inlet valve I-1 or I-4 could be interrupted | Check with ohmmeter valves I-1 and I-4 | Replace solenoid valve I-1 or I-4 | |
| Check contact 67-69 and 63-57 of timer | If contacts do not close, replace timer | ||
| If it happens during main wash, inlet valve I-3 could be interrupted | Check valve I-3 with ohmmeter | Replace solenoid of water inlet valve I-3 | |
| Check contact 65-71 of timer | If contacts do not close, replace timer | ||
| If it happends during the rinses, inlet valve I-7 or I-2 could be interrupted | Check with ohmmeter valves I-2 and I-7 | Replace solenoid of water inlet valve I-2 or I-7 | |
| Check contacts 70-68, 53-51, 55-49, and 39-33 | Replace timer if contacts do not close | ||
| Water inlet filters completely clogged | Water doesn’t come into the machine | Clean or replace filters | |
| 10. Water still coming in until overflow and machine still goes on filling | Failure of water level control switch | Remove wire from water level control switch. If water stops coming in, then water level control switch is stuck or there are air leaks in water level pipe | Replace water level control switch or pipe |
| Failure of water inlet valves | Shut off machine completely and let water faucet open. If water is still coming in, there must be dirt in the water inlet valve or pressure of the feeding line is below 3,5 PSI | Take down valve and clean diaphragm. Put together again | |
| Put more pressure in the line by installing a pump | |||
| 11. Machine will not drain, will also
fail to take soap for wash and will not spin NOTE:
at the end of the cycle, there will still be water in tub and be careful
when opening the door |
The motor of the drain valve is interrupted | Check with ohmmeter | Replace motor |
| The solenoid of contactor R1 is interrupted | Check with ohmmeter | Replace solenoid or contactor as necessary | |
| Contact 31 R1 of the contactor 32 R1 does not close anymore when R1 is attracted |
Check with ohmmeter. During any drain contact 31 32 R1 Must be closed |
Replace contactor | |
| Contact 27(29) of the timer does not Close during the steps of drain and spin |
Check on these steps with ohmmeter | Repair contact or replace timer | |
| 12. Water fill times too long on machines | Drain valve doesn’t shut completely and water is flowing away slowly | By removing of drain hose can be checked easily | Clean drain valve |
| Low water pressure on line | To fill normally pressure should be at least 28 PSI. If not, it is possible that soap remains in soap dispenser | Modify installation as required | |
| Inlet filter fouled | Normally inlet valves are filling the machines with 5,29ft /min | Clean or replace filter | |
| 13. Water too hot in prewash | Malfunction of water mixing | Check temperature with thermometer. It may not be higher than 40 C. Water inlet valve I-1 is interrupted and hot water only is filling the machine | Replace solenoid I-1 or filter of water inlet valve I-1 is fouled and water mixing is not correct anymore |
| Contact 69 of timer does not 67 close anymore |
Repair contact or replace timer as necessary | ||
| 14. Water too cold in prewash | Malfunction of water mixing | Check temperature with thermometer. Inlet valve I-4 is interrupted and cold water only is filling the machine | Replace solenoid I-4 |
| Water valve I-4 is fouled | Clean inlet filter | ||
| Contact 69 of timer does not 67 close anymore |
Check contact and repair or replace timer | ||
| Electric interruption towards Contact 63(57) of timer |
Repair connection | ||
| 15. No waterfill (hot) in wash | Failure of water inlet valve I-3 | As there is no water level control program will go on but
soap will remain in soap dispenser. But if there is a low water level control
(1 7)cycle will not advance anymore |
Replace solenoid I-3 |
| Contact 71 of timer does not 65 close |
Repair contact or replace timer | ||
| 16. Machine will not fill in rinses | Failure of inlet valve I-1 or I-7 | Check solenoid with ohmmeter in 1st rinse: I-7 +I-1 or Contact 68 or 69 70 67 In 2nd rinse : I-7 Or contact 55 or 39 49 33 |
Replace solenoid or repair contact or replace timer as
necessary Replace solenoid or repair contact or replace timer as necessary Replace solenoid or repair contact or replace timer as
necessary |
| 17. Failure of automatic suds control system | Inadequate dosage of soap | If too much soap is used during the extraction foam will open lid of soap dispenser and water + foam will split over. Moreover, this foam can switch on and off water level switch, with as result that machine fills each time. | Use adequate soap powder with foam breaker and avoid overdosage |
| 18. Excessive vibration | Inadequate foundation | Entire machine appears to be moving excessively | Construct adequate foundation |
| Nuts on machine mounting bolts loose | Foundation appears to be solid but machine is visibly moving | Re- tighten nuts | |
| 19. Machine goes on extracting | Contact 47 doesn’t open 41 because micromotor M1 is interrupted |
Check micromotor M1 with voltmeter or test lamp | Replace micromotor M1 or timer as necessary |
| Contact 13(11) 30” doesn’t close |
Check if contact 13(11) is closed |
Repair contact or replace timer | |
| 20. Machine doesn’t spin | Contact 47(41) not closed |
Check if contact 13(11) is closed |
Repair contact or replace timer |
| The starting contact R(S) of the Reversing switch not closed |
During steps on which contact 47 is closed, short circuit 41 contact R(S) If machine spins, contact R/S is the cause of the malfunction |
Repair contact R(S) of the reversing Switch or replace reversing switch as necessary |
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| Solenoid of contractor R3 interrupted | Check with voltmeter | Replace solenoid or contactor R3 | |
| Contact 53(54)of R3( auxiliary Contact) not closed during spin (for machines with such a contact) |
Check with voltmeter | Replace auxiliary contact | |
| Drain valve fails to open | When solenoid is accuated check distance of closing part drain valve | Increase compressive force of spring by folding it | |
| Water level control switch contract 11-12 is open | Check with ohmmeter | Replace water level control switch or clean air pipe to tub | |
| 21. Motor runs but cylinder doesn’t run | Drive belt loose, broken or not connected | See at back and note condition of drive belt | Replace drive belt if necessary |
| Pulley of motor shaft loose | Check if nuts are not loose | RE-tighten nuts | |
| Pulley on cylinder loose | Check if fastened by limit ring - could turn loose | Fasten limit ring on shaft | |
[Please feel free
to Email Metro Laundry tech anytime when you have question.] |
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