Repair
Repair Price: $ 584.00
Purchase
CSL Part Number: 34319
Product Overview: The Sterlco M2B REV A with 785A353U output board is a temperature control system designed for precision thermal management in industrial heating and cooling applications. This panel-based controller operates on 120VAC and supports a temperature range of -30°F to 650°F, utilizing thermocouple inputs for process monitoring and setpoint control. Commonly found in plastic molding equipment, heat exchangers, and process chillers, it features integrated display, control buttons, and switching outputs to regulate heating or cooling elements. The system includes primary and secondary power supplies with MOSFET switching circuits to drive connected thermal equipment.
Category: Chiller Controls
Manufacturer: Sterlco
Manufacturer Synonyms: Sterling
Manufacturer Part Number: M2B REV A W/785A353U
Series: M2B Temperature Controller
Keypad replacement if required is additional and will be quoted after evaluation
Common Failures
Common issues reported with this product include displays that do not light up despite power being present, which can prevent viewing setpoints or processes. Another frequently reported issue is the controller not displaying a reading on return temperature.
Repair Approach
Repairs often involve replacing defective components in the power supply, such as shorted transistors and open resistors. In some cases, components like the main filter capacitor are identified as faulty due to visible damage. Additional repair steps may include replacing incorrect or improperly installed components, and in some cases, replacing optoisolators as a precaution.
Testing & Quality
Testing after repairs typically involves verifying basic functions with thermocouples and load testing to ensure proper functionality. Repaired units are subject to functional testing before return.
Service and repair your broken Sterlco part
We can repair your Sterlco model M2B REV A W/785A353U in our facility. Let our skilled technicians get your Sterlco back in operation quickly.
Step 1 - Click the green 'Repair Now' button above to add the part and then complete the RMA.
Step 2 - The RMA form will be sent to you via email. Print the RMA form and put it in a box with the item(s) for repair.
Step 3 - Ship or mail the box to the address listed on the RMA.
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