Alarm Maintenance Maintenance of this unit is performed only in the form of return to and repair at SMC’s site. As a rule, SMC will not conduct on-site maintenance. Separately, the following parts have a limited life and need to be replaced before the life ends. Parts Life Expectation Description Expected life 3 to 5 years 5 to 10 years 5 to 10 years Pump Fan DC power supply Display panel 50,000 hours (approx. 5 years) Possible failure The bearing is worn so the pump fails to transfer the circulating fluid, which results in temperature control failure. The bearing uses up lubrication and makes the fan unable to supply enough air, which increases the internal temperature of the Thermo-con, and activates the overheat protection of the power supply and generates the alarm. The capacity of the electrolytic condenser decreases, and causes abnormal voltage which results in DC power supply failure and stops the Thermo-con. The display turns off when the backlight of the LCD reaches the end of its life. This unit is equipped as standard with a function allowing 15 kinds of alarms to display on the LCD and can be read out by serial communication. Also, it can generate relay output for upper/lower temperature limit alarm and output cut-off alarm. Alarm code Alarm description Operation status Main reason WRN ERR00 ERR01 ERR03 ERR04 ERR11 ERR12 ERR13 ERR14 ERR15 ERR16 ERR17 ERR18 ERR19 ERR20 Upper/Lower temp. limit alarm CPU hung-up CPU check error Back-up data error EEPROM writing error DC power supply failure Internal temp. sensor high temp. error Internal temp. sensor low temp. error Thermostat alarm Abnormal output alarm Pump failure .1 or low circulating fluid level alarm .2 Internal temp. sensor disconnection alarm External temp. sensor disconnection alarm Abnormal auto tuning alarm Low fluid level alarm .3 Continue Stop Stop Stop Stop Stop Stop Stop Stop Continue Stop Continue Stop Stop Stop The temperature has exceeded the upper or lower limit of the target temperature. The CPU has crashed due to noise, etc. The contents of the CPU cannot be read out correctly when the power supply is turned on. The data cannot be written to EEPROM. The DC power supply has failed (due to abnormal high temperature) or an irregular voltage has occurred or the thermo-module has been short-circuited. The internal temperature sensor has exceeded the upper limit of cut-off temperature. The thermostat has been activated due to insufficient of the facility water or high temperature. The temperature cannot be changed even at 100% output due to overload or disconnection of the thermo-module. The pump has been overloaded .1 or the flow switch is activated .2. The external temperature sensor has been disconnected or short-circuited. (Only detected when in learning control or external tune control.) Auto tuning has not been completed within 20 minutes. The amount of circulating fluid in the tank has dropped and the level switch is activated. The internal temperature sensor has been disconnected or short-circuited. The internal temperature sensor has exceeded the lower limit of cut-off temperature. The contents of the back-up data cannot be read out correctly when the power supply is turned on. .1 The HEC012 only .2 Optional for the HEC001 and HEC003 only (Not available for the HEC006) .3 Optional for the HEC001 and HEC003 Series HEC-W 1408