How to solve the following two failures of drying oven?

Some problems may occur when the drying cabinet is permanent or improperly used. As a laboratory equipment worker, I know that the two situations of the drying oven are the most common faults:
plug in the power supply to turn on the power switch equipment and there is no response 
* the power supply problem, please ask an electrician to help solve it. 
* If the electric heating tube is burnt out, the resistance value at both ends of the electric heating tube can be measured with a multimeter "ohm". If the resistance value is 0, the electric heating wire is short-circuited, showing that the switch always jumps.  If the resistance value is several hundred kiloohms or infinity, it indicates that the heating wire is open when it is fused.
 * power switch insert falls off.
 * The power switch is on to check the control circuit board and the corresponding connecting wires. 
The temperature cannot rise 
* check whether the timing time has run to the timing set value;
 ★ Most users do not understand this function. When the timing time reaches the timing value, the heating pipe will not work and the fan will not rotate, resulting in no heating and no temperature rise.
 * check whether the fan is running, if it is bad (use multimeter to measure whether there is 220v voltage at the two ends of the fan pin), notify the company to mail the accessories to solve it. 
* check the circuit control board, use multimeter to see if there is any output, check according to the drawings;  (Drawings attached). 
* Check whether the applied voltage is within ~ 220 V (the voltage fluctuation is within 10%). 
You can go there if necessary: kenton Instrument（en.kentonchina.com）.  There are all kinds of drying ovens.

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