| Problem |
| Possible cause |
| Corrective action |
|
|
| Loss of fluid in process. |
| Check all lines/connections/ |
|
|
|
| fittings. | |
|
|
|
|
| |
|
|
| Vent valve open. |
| Allow vent timer to run out; or, |
|
|
|
| check valve operation when unit | |
| Unit does not heat properly/can |
|
|
| is cold by opening the fill port. |
|
|
|
| Switch to Manual Cool mode | |
| not achieve set point. |
| Faulty/dirty solenoid valve; |
| several times to flush valve. If |
|
|
| usually detected when there is a |
| the leak continues, disconnect |
|
|
| steady stream or trickle of water |
| the power to the unit, turn off |
|
|
| out of the drain line. |
| the water supply, and clean or |
|
|
|
|
| replace the solenoid. |
|
|
| Degraded fluid. | Drain and replace fluid. | |
|
|
| Defective heater contactor. |
| Visual inspection of coil and |
|
|
|
| contacts. Repair/replace | |
|
|
|
|
| defective contactors. |
|
|
|
|
| Check resistance on all three (3) |
|
|
| Defective immersion heater. |
| legs of heater with an ohmmeter. |
|
|
|
| If not all equal, contact factory | |
|
|
|
|
| |
|
|
|
|
| for replacement heater. |
|
|
|
|
| Check heater tank for scorched/ |
| Unit does not heat. |
|
|
| discolored paint. Check |
|
| Heater burnout. |
| resistance on all three (3) legs of | |
|
|
|
| ||
|
|
|
|
| heater with an ohmmeter. |
|
|
|
|
| Replace heater as needed. |
|
|
|
|
| Check the heater output with an |
|
|
|
|
| ohmmeter to ground. It should |
|
|
| Controller heater output open. |
| read in the |
|
|
|
|
| Infinite or zero readings indicate |
|
|
|
|
| a defective output. |
|
|
| Clogged Y strainer. |
| Clean Y strainer. |
|
|
| Water supply to unit is turned |
| Open water supply. |
|
|
| OFF. |
| |
|
|
|
|
| |
|
|
| Water drain is plugged or |
| Clear drain line or eliminate |
|
|
| excessive back pressure in drain |
| |
|
|
|
| back pressure condition. | |
|
|
| line. |
| |
| Unit overheats/unable to cool. |
|
|
| |
|
| Heat exchanger tubes plugged |
| Remove tube bundles; clean/ | |
|
|
| by lime deposits. |
| replace as required. |
|
|
|
|
| Test solenoid valve by switching |
|
|
| Faulty solenoid valve. |
| to Manual Cool mode and listen |
|
|
|
| for valve operation. Replace if | |
|
|
|
|
| |
|
|
|
|
| faulty. |
Upright Portable Hot Oil TCUs | Chapter 6: Troubleshooting | 37 |
