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What is Technical Fault 51?

Technical Fault 51 appeared on the display a few moments ago, but when I switched off and reset the machine it worked normally. What does this warning message mean?

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The most common reason for this code is :-

F51 error is caused by a faulty or blocked heater pressure switch. It is not a job for an unqualified person.

"The program is interrupted and the drain pump is operated. The display shows Technical fault F51. Call Service Department. The buzzer is activated for 2 minutes. "

Posted on Apr 14, 2015

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017


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What is Technical Fault 51? It appeared a few moments ago on our machine, but when I switched it off and reset the machine it worked as normal again.

F51 Heater pressure switch The program is interrupted and the drain pump is operated. The display shows Technical fault F51. Call Service Department. The buzzer is activated for 2 minutes.

Background information:

Start position: One second after the program start, heater relay K1/1 is activated. This enables a check as to whether the contacts on heater pressure switch B1/13 have closed on switching steps 21/22 or 11/12.

Heater relay defective; contact open.

Replace the heater relay.

Heater relay solenoid defective.

Replace the heater relay.

Connection from heater relay to electronic module open-circuited.


1. Check plug connections.

2. Check the connection wires for continuity.

Heater pressure switch open- or short-circuited.

Replace the heater pressure switch.

Connection from heater pressure switch to electronic open-circuited.


1. Check plug connections.

2. Check the connection wires for continuity.

Foreign objects in heater pressure switch.

Replace the heater pressure switch.

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The refill guy may done somthing which by pass the CRUM chip. At your end you may check the module attached to the toner cart.and test with alter that chip.
This may solve.
Before doing this pl.check the errorcode display .there might be other related problem with the machine.

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Code error 00-00-00 30-00-28

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Hi there.
Please try .
Try this.
The error code c3451 refers to a copier warm up error; the machine had not reached the correct temp within a specific time.

I bet it happened when you first switched on one morning.
Easy to reset and fault usually goes away.

To Reset switch machine off using the switch inside the front door, not the one on the control panel.
Whilst holding the UTILITY key down on the control panel switch the machine back on keeping the UTILITY key held down. Eventually a Trouble reset key will be displayed in the LCD screen, touch this, OK will be displayed then power the machine off and then back on.

This will reset the error code, if the code reoccurs then there will be a problem with the fuser unit in the machine, and this will requir
e replacing.

Hope it did work for you.

Please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.

All The Best: Pineworks

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I found mine did the same I pusshed the face and it came back on. It appears fault within circuitry of clock and will need to be replaced

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