The heater won't start.

depends on where the thermostat control is
normally it would plug into a control box for switching on/off of the heater by the thermostat or by a switch for manual operation

It could be a fuse. They are small look kinda like a metal diode. Unplug heater, disconnect one side of power wire and do a continuity check on the heat strip circuit. You can also plug it in and do a voltage check on the two wires connected to the heat strip. Do this to see if you are getting voltage to the strips. Some heaters have safety switches that disconnect power when the heater falls over. It's a free swinging switch that might not have reset.

accessories fuse check this.
check heater switch - see if 12v at heater switch
Check if 12v applied to relay coil to switch it

David: Try downloading this free user manual: http://laundry.manualsonline.com/manuals/mfg/miele/pw_6065.htmlk According to ApplianceHelponline.: " 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.

Cause:
Heater relay defective; contact open.

Remedy:
Replace the heater relay.

Cause:
Heater relay solenoid defective.

Remedy:
Replace the heater relay.

Cause:
Connection from heater relay to electronic module open-circuited.

Remedy:

1. Check plug connections.

2. Check the connection wires for continuity.

Cause:
Heater pressure switch open- or short-circuited.

Remedy:
Replace the heater pressure switch.

Cause:
Connection from heater pressure switch to electronic open-circuited.

Remedy:

1. Check plug connections.

2. Check the connection wires for continuity.

Cause:
Foreign objects in heater pressure switch.

Remedy:
Replace the heater pressure switch."

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.

Cause:
Heater relay defective; contact open.

Remedy:
Replace the heater relay.

Cause:
Heater relay solenoid defective.

Remedy:
Replace the heater relay.

Cause:
Connection from heater relay to electronic module open-circuited.

Remedy:

1. Check plug connections.

2. Check the connection wires for continuity.

Cause:
Heater pressure switch open- or short-circuited.

Remedy:
Replace the heater pressure switch.

Cause:
Connection from heater pressure switch to electronic open-circuited.

Remedy:

1. Check plug connections.

2. Check the connection wires for continuity.

Cause:
Foreign objects in heater pressure switch.

Remedy:
Replace the heater pressure switch.

did you check for power where plugging it in???

Please help us understand what you mean by 'The Socket Switch'-- are you talking about the socket where the heater is plugged into the wall outlet?- or are you talking about the on-off switch on the heater unit itself? (They do burn out, and 'weld the contacts together' internall-- and you can not shut them off, except by un-plugging.
Tell us more-- and we can help you more.- Mack B

Tilt switch failure is a strong possibility. They can be finicky

Your pressure switch may not be activating (ie closing and making contacts) This means you could have a blocked flue, clogged pressure switch tube or a bad pressure switch. The pressure switch is a safety feature to ensure your exhaust is not blocked and operating correctly. Find owners manual. Look at trouble shooting section. Open cabinet and look for error code light. If blinking 3 times, try "jumping" the pressure switch. To jump pressure switch you need to clear code be turning off power. When the unit/thermostat calls for heat the power vent fan starts first, this is when you need to jump the pressure switch. You need to do this in sequence. That is the unit first starts the power vent exhaust thus activating the pressure switch allowing the ignition cycle to the burners and heat. So the power vent fan needs to start first BEFORE you put the jumper on to bypass the pressure switch. Once the jumper is on it will call for ignition after approx 30 seconds. If ignites your problem is one of the 3 stated at the opening of this paragraph

If the switch is easy to access, you could simply replace it -- but finding the switch may be nearly impossible, because of the type of unit you are talking about. Also, some of these oil gel heaters have the electronics encased in a non-acessable area, meaning if one component goes bad, the unit is basically done. Your best bet to find the switch is to start with the manufactures website. if there are no diagrams or repair manuals, you should be able to find some contact information about repairs