How do I replace broken water tank sensor? - Saeco Magic Comfort Plus Espresso Machine

There's a float in the watertank that should go up when the tank is full. A sensor in the machine will tell it that there's enough water in the tank. So, the float can be stuck, if not then maybe there's something wrong with the sensor. Or, worse, the main board is broken. Hope this helps a bit.

ALARMS THAT STOP THE DISHWASHER

A1 Want of water

Is the water cock open?

Does the water load solenoid valve work?

Is the water feed flow a min. of 5 l/min?

Is the water inlet filter clean?

Is the load solenoid valve filter clean?

Is the overflow inserted?

Do the tank/boiler pressure switches work properly?



C9 Automatic hood out of order

Alarm codes for automatic hood type dishwasher (see paragraph 9.2.1 Alarm codes for automatic

hood type dishwashers)



C12 Tank level sensor out of order

Are the connectors correctly connected?

Are connector contacts cleaned?

Does the air trap of the tank work correctly?

Is the level sensor broken (replace it with a new one)?



Alarm codes for automatic hood type dishwashers

When the alarm C9 appears, to facilitate fault-finding a parameter providing a more detailed indication has

been introduced.

The parameter is C9 and is found in the ron family.

The possible cause of the anomaly can be found (see next table) according to the value of the parameter C9.

E.g.: With an automatic hood type the alarm C9 appears.

Access the parameter C9 in the ron family.

Assuming the value displayed is:

20 ? During lifting, the current absorbed by the lifting motor has exceeded the threshold. This can happen if

a rack or other heavy material was placed on the hood.









ALARMS THAT DON'T STOP THE DISHWASHER (SHOWN ON THE USER INTERFACE AT REGULAR INTERVALS)

b1 Drain not efficient

Has the overflow been removed?

Is the water drain blocked?

Is the drain pump blocked?

Are the air trap and tank pressure switch clean?

Is there a constriction in the drain tube?

Is the pump breather pipe returning to the tank clogged or constricted?

Does the tank pressure switch work properly?

Is there a hole in the drain tube (only for versions with drain pump)?



b2 Overflow alarm

Is the water drain blocked?

Are the air trap and tank pressure switch clean?

Does the tank pressure switch work properly?

Is the load solenoid valve blocked? (see electrical wiring diagram - YV1 Filling solenoid valve)

Is the load solenoid valve relay stuck? (see electrical wiring diagram - RL5 relay of AP2 board)



C1 Boiler temperature rise too fast

Does the boiler level sensor work properly? The boiler could be empty.

Are no-original power resistances installed?



C2 Boiler temperature too high

Has the boiler temperature been changed (btC - increased above 90°C)?

Has the software alarm value been modified (bH,)?

Does the boiler level sensor work properly?

Boiler relay/relays sticked (see electrical wiring diagram - RL1/ RL2/ RL3 relays of AP2 board)?



C3 Tank temperature too high

Is the feed water above 60°C?

Has the software alarm value been modified (tHi)?

Is the rinse water temperature too high?

Is the tank relay stuck (see electrical wiring diagram - RL4 relay of AP2 board)?



C4 Tank temperature sensor out of order

Is the temperature sensor broken or disconnected (see electrical wiring diagram - ST1 Tank

probe)?

Is the temperature sensor connector correctly inserted?



C5 Tank temperature sensor out of order

Is the temperature sensor short-circuited (see electrical wiring diagram - ST1 Tank probe)?



C6 Boiler temperature sensor out of order

Is the temperature sensor broken or disconnected (see electrical wiring diagram - ST2 Boiler

probe)?

Is the temperature sensor connector correctly inserted?



C7 Boiler temperature sensor out of order

Is the temperature sensor short-circuited (see electrical wiring diagram - ST2 boiler probe)?



C10 Rinse temperature sensor out of order (only on machines with temperature sensor on the rinse circuit)

Is the temperature sensor broken or disconnected?

Is the temperature sensor connector correctly inserted?

C11 Rinse temperature sensor out of order (only on machines with temperature sensor on the rinse circuit)

Is the temperature sensor short-circuited?

C13 Rinse pump out of order (the water level of the boiler does not decrease)

Does the rinse pump work correctly?

Is there any bottleneck in the hose, that connect the air trap and the board sensor?



WARNING:

Alarms C2, C6 and C7 lock the boiler temperature control.

Alarms C3, C4 and C5 lock the tank temperature control.

In the case of alarms C6 and C7, the boiler waiting phase is not executed (the rinse may be performed

with cold water) and, during the initial warm-up and subsequent rinses ( btF > 0 ), the boiler heating

phase is not executed.

In the case of an open probe error ( C4, C6 e C10 ), the displayed temperature is 10°C

In the case of a shorted probe error ( C5,C7 e C11 ) , the displayed temperature is 99°C.



E1 Communication error

Is the connection between main board and control panel correct? Are the connectors correctly

connected?

Are connector contacts clean?

E2 Tank temperature low

Does the tank heating element work properly?

Are the connectors correctly connected?

Are the dishwasher feed voltage and current correct?

Is the relay RL4 (see electrical wiring diagram - RL4 relay of AP2 board) on the board disconnected

or faulty?

E3 Boiler temperature low

Does/do the boiler heating element/s work properly?

Are the connectors correctly connected?

Does the possible remote control switch connected to the heating element work correctly?

Is there power at the remote control switch input terminals?

Do boiler relays (see electrical wiring diagram - RL1/ RL2/ RL3 relays of AP2 board) work properly?



CAUTION: IF THERE IS A MALFUNCTION ON RELAY RL1 AND THE BOILER HEATING ELEMENTS

ARE FED BY MEANS OF A REMOTE CONTROL SWITCH, THE BOARD DOES NOT

HAVE TO BE REPLACED; JUST MOVE THE BOILER HEATING ELEMENT CONNECTOR TO

ONE OF THE TWO FREE POSITIONS ON THE BOARD.

CAUTION: WHEN ONE BRANCH OF THE HEATING ELEMENT DOES NOT WORK AND THE

OTHER TWO CONTINUE TO FUNCTION, ON REACHING THE SET TEMPERATURE VALUE,

ALARM 3 DISAPPEARS AND REAPPEARS IN THE SUBSEQUENT RINSE PHASE. THIS

ALSO OCCURS WHEN A PHASE IS MISSING.



Dado

Have you filled the radiator or just the reservoir tank. The sensor in the radiator top tank requires water for it to complete the circuit to keep the light out. No water and the circuit is broken so the light comes on. The same will happen it he wire to the sensor has broken off. If all ok then reset with a code reader

these humidifiers are total junk. The sensors are cheap and get stuck or broken so easily. for your problem tho, you can either find the sensor by taking off the cover and use your hands to break free any stuff causing it to get stuck or you can drill a hole in the water tank and insert some fish tank tubing and let the water drain out as it collects.

not the pump but air in the system or a broken wire to the coolant level sensor
that sensor at the top of the radiator tank has to be completely immersed in coolant or the circuit is broken and the light comes on
same effect id the wire to that sensor is broken in the insulation

Check the Float Rocker inside the water tank. Sometimes this comes off the retainer when filling the tank. If this is an older machine from early 2000's or 90's the tanks will have different type of sensors. Most of them that are older the sensors are normally broken and need replacements.

possible water pump impeller broken

For images and product information
For manual


You checked ohms, did you check for 240V across lower element when lower element is turned on?

Energy smart electric water heater has a control box on top of unit. Water heater does not have typical thermostats that can be tested and replaced. Temperature sensors located above each element send information to control box through small black and red wires. Temperature sensor sells for about $40, but there is no test listed that shows how to determine when sensors fail.

Potential problems:
-Temperature sensor is not reading correct temp
-Control box not processing correct temperature information
-Selector on control box set to 2, 3 or 4
-Thermostat temp on control box set lower than 120 degrees F
-Sediment build-up starting to surround lower element so water doesn't circulate (see if drain valve runs full-open

cat might be burnt it might be a bad sensor or a broken wire in the o2 sensor