Here's some excerpts from the workshop manual that may help you.
FAULT WARNING MODE - if the temp display flashes for approx 6 secs when IGN is first switched ON, a system fault is indicated.
So if that happens (or even if it doesn't and you want to check anyway) you can then enter the SELF TEST MODE -
Warm engine coolant to at least 45 degrees C
Turn IGN switch ON
Press MODE and OFF buttons simultaneously and release
The control does a self test (shows all segments of the display for a few secs) - when the self test is completed and if the system checks out OK the display will read OFF. If the system has a fault the display will read E and a number from 1 to 8. In case there is more than one fault code you can cycle through all codes by using the AUTO button.
Now if you can get it to work for you and any E Codes show up let me know what they are and I can refer to the list for you. However there is no code for a faulty blower - go figure. The whole exercise may just be a waste of time for you but for future reference it's probably handy to know.
BTW Pressing the AUTO button is also the way to exit the Self Test Mode so if no codes are thrown just press it to reset the system to normal operation. Furthermore, you then need to do the IGN OFF/ON cycle two more times before starting the engine to ensure the system is reset.
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