Had no heat. replaced thermostat, heat returned for 15 minutes, then no heat again.

I think you have a leaking head gasket, this causes the symptoms you have.

try the thermostat first . it may be sticking!!

Check for low coolant, you might also have a sticking thermostat. Alot of fords get air pockets, make sure if it needs coolant to let it run for about 10-15 min with the radiator cap off.

Sorry to say, that annoying clicking sound is the thermostat calling for cooling/heat. Whenever the temperature is reached it will "click" off and then "click" back on when needed. Some thermostats are quieter, but all digital thermostats will have that sound. Sorry again and I hope this answers your question!

The operating thermostat has probably failed. When the dryer haets up, it gets too hot and the high limit thermostat turns the machine off. After it cools down, it will start, again.

The problem is more likely a high temp limit switch. I don't have a schematic of your dryer, but one should be included somewhere on the dryer. You have to use a voltmeter to test the components in the circuit. The thermostat controls the heat temp, you may want to start there

check the in-line limiters on the heating coil tube.

We have the same model. From the manual:
STEP 1: Slide the system switch to the HEAT or COOL position to program the corresponding system
STEP 2: Press PROGRAM to enter program mode. Heat or cool will be displayed on the LCD.
STEP 3: Press the UP or DOWN arrow. The Program hour and AM or PM indicator are flashing. Press to change the hour.
STEP 4: Press PROGRAM to change to the minute position. The current minute will be flashing. Press the UP or DOWN arrow to change the minute.
STEP 5: Press PROGRAM to change to the program temperature. The current temperature will be flashing. Press the UP or DOWN arrow to change the temperature.
STEP 6: Press PROGRAM again to move to the next program number. Repeat Steps 3-5 to change the remaining Weekday and Weekend Programs. [there are a total of 8 programs]
After cycling through all 8 programs, press PROGRAM again to return the display to normal. Press HOLD/RET at any time to exit the Program Mode.

TEMPORARY MANUAL OVERRIDE:
To temporarily change the current set temperature without affecting your program:

• Press either ARROW and hold for about 1 second to enter the Manual Override Mode. When display flashes, you can release the key.
• Press the ARROW to change to your desired Temperature
• Press HOLD/RET to return to normal mode, or wait 15 sections for it to return automatically.
• The current program number will flash to signify the Temporary Overide.
• At the next program change time, the Temporary Override is cancelled, and the next program temperature becomes the setpoint temperature.

Hope this is what you need. God Bless.

sounds like you are replacing the hi limit thermostat try replacing it with the cycling thermostat as well

We have the same problem with our oven, AEG B2190-1.It started on on Christmas day[worst day of year]gets up to temperature after 10-15 minutes cuts out everything switches off until the oven has cooled down, The oven is only 18 months old. We have been told that it is a thermostat problem.