Microtech User Manual 2018
Page 5of 6
5. Maintenance
1. No action after turn on the machine
1). Check the plug as to whether it connects well enough to the wall socket or whether it is
broken.
2). Check the power switch or the digital controller whether it is broken.
3). Check the fuse whether it has been burnt out.
4). If the indicating light is on, but there is no visible display on screen, check the 5 cables of the
Railway transformer. If it’s loose this shows the problem is the result of a poor connection. If it
connects well, this could be the transformer is faulty.
2. The display screen is working well, but the temperature is not increasing on the mug
heater.
1). Check whether the thermocouple of the mug heater is connected well. If the thermocouple is
loose, the display will show 255℃and also results in the machine beeping.
2). Check if the indicating light of solid-state relay is on, if not, check if the relay or digital
controller is broken.
3). If you already changed the new solid-state relay but the mug heater still can’t heat up,
check if the mug heater is faulty or the mug heater’s power cable is loose, if it is faulty a
replacement mug heater will be required.
3. The display screen shows 255℃once you power on.
1). Check whether the thermocouple connection is loose or not.
2). If the thermocouple is connected well, but still shows a temperature of 255℃, then it is faulty.
4. The machine is heating during 0~180℃, but display number jumps to above 200℃or
300℃suddenly, or the numbers on display jumps irregularly.
1). Check whether the thermocouple of the mug heater is connected well.
2). If the thermocouple is connected, it shows that the program of the digital controller is broken.
A replacement controller will be required.
5. The temperature is out of control: Set temperature is 180℃，but the actual temperature
is above 200℃
1). This means the solid-state relay is broken, when the temperature is out of control, the relay
will need to be replaced.
2). Or the digital controller is faulty and it keeps conveying electric to the relay, a replacement
controller will be required.
6. The setting temp and time becomes abnormal after exchange the mug heater.
1). Please reset the temp and time referring to the operation process manual.
7. Other notices
1). In order to prolong the machine service life, please add the lubrication oil regularly to the
joints.
2). In order to keep the mug heaters transfer effect, please protect it carefully whenever you are
using or not.
3). Please store the machine in a dry place.
