| Micro Series Water Temperature Control Units | ||
| Reference Manual (PN: 682.89373.00) for | ||
| Complete Operation and Installation Instructions | ||
| (Available online at www.sterlco.com) | ||
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| Troubleshooting - Quick Guide | ||
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Problem | Possible cause | Solution | |
| No power. | Check main disconnect, fuses, wiring, and | |
| power lead to unit. | ||
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| Wrong voltage supplied to unit. | Voltage must be within plus or minus 10% of | |
Unit does not turn on | nameplate rating. | ||
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| Defective on/off switch. | Replace. | |
| Control circuit fuse blown. | Replace. | |
| Defective control transformer. | Check transformer. | |
| Broken or loose wire in pump motor control circuit. | Locate and repair. | |
| Pump motor contactor holding coil is open. | Repair or replace. | |
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| Check for at least 16 psig (110.32 kPa/1.1 | |
Unit does not run | Low water pressure light on. | bars) water pressure on WATER IN or CITY | |
| WATER MAKEUP. | ||
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| Water supply to unit is turned off. | Open water supply. | |
| Pump overload light on. | Reset and test each leg for balanced amp | |
| draws. | ||
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| Undersized connectors/ water lines. | Increase size of connectors/ water lines. | |
| Long connecting lines between unit and mold. | Move the unit closer to the mold and shorten | |
| connecting lines. | ||
Temperature fluctuations/ |
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Serpentine flow through mold. | Connect lines for parallel flow instead of | ||
rapid cycling from hot to | series flow. | ||
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cold. |
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Blocked water line in mold. | Check mold for metal chips or lime buildup. | ||
| Clean mold. | ||
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| Quick disconnect fitting with check valve. | Remove and replace fitting or valve. | |
| Lime buildup in unit piping. | Clean or replace. | |
| Drain is plugged or excessive back pressure is in drain | Clear drain line or eliminate back pressure | |
| line. | condition. | |
| Faulty solenoid valve. | Test solenoid valve by pressing VENT | |
| button and listen for valve operation. | ||
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| Replace if faulty. | |
| Controller Cool output relay open. | Replace output relay. | |
Unit overheats or does not | Solenoid valve is not operating, but COOL LED is on. | Set process temperature to minimum and | |
check for magnetism on solenoid coil top. | |||
cool |
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Solenoid coil circuit is open. | Check coil resistance. If MΩ range, replace | ||
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| solenoid coil. | ||
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| Modulating valve is not operating, but OUT2 LED is on. | Set process temperature to minimum and | |
| check for complete travel of valve. | ||
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| Insufficient pressure differential between cooling | Find a means to get less back pressure in | |
| WATER IN and OUT lines. | the WATER OUT line. | |
| Cooling valve is undersize. | Replace cooling valve with a larger valve. | |
| Defective heater contactor. | Visually inspect coil and contacts; | |
| repair/replace defective contactors. | ||
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| Check resistance on all three (3) legs of the | |
Unit does not heat/cannot | Defective immersion heater. | heater with an ohm meter. If not all equal, | |
| contact factory for replacement heater. | ||
achieve set point |
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Heater contactor is not energizing, but HEAT LED is on. | Set process temperature to maximum and | ||
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| check for control voltage at heater contactor. | ||
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| Faulty/dirty solenoid valve. | Press VENT button several times to flush | |
| the valve. | ||
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Sterling, Inc. |
| Part No: 682.92594.10 | |
2900 S. 160th Street · New Berlin, WI 53151 · USA | Bulletin No: | ||
Tel. 262.641.8610 • Fax 262.641.8653
