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J3C TYPE ELECTRIC ACTUATOR TROUBLESHOOTING GUIDE
WHAT THIS GUIDE IS, AND HOW TO USE IT
This comprehensive document provides POSSIBLE SOLUTIONS and/or ADVICE for reported
‘faulty’ actuators, and is intended purely as a guide to identify possible causes and
remedies for actuators that are not working as expected.
• Use the index to identify the page in the document most likely to help.
• When a user sends a command signal to an actuated valve and it doesn’t respond, it is
usually automatically assumed that the actuator is faulty. In practice, in most cases, the
fault is either with the valve, or with the electrical system controlling the actuator, and
not the actuator itself.
• This document is intended to help identify where the problem is. J+J are not qualified
electrical, electronic or control engineers and therefore ‘POSSIBLE SOLUTIONS/ ADVICE’
contained in this document are only suggestions and recommendations based on 20 years
of practical experience.
• The warranty on the J3C S Type electric actuator relates to the product itself, and does
not extend beyond those parts supplied. All external equipment/ wiring/ influences are
provided by, and are the sole responsibility of, the customer.
• Errors & omissions excluded and subject to correction when identified.
INDEX
Page No
Symptom or description
1
How to use this guide & Index
2
LED light
3
LED not lit, actuator doesn’t work
4
LED lit solidly but actuator doesn’t work
4
LED flashing and actuator doesn’t work
5 & 6
Electronic Torque Limiter engaged
7 & 8
Manual Override Engaged
9
LED flashing when the actuator is NOT fitted to valve
10 & 11
PCB Issues
11
Actuator drives continuously
12
Failsafe function issues (BSR installed)
13
Modulating function/ positioner issues (DPS installed)
14
Modulating function/ positioner soft reset
14 & 15
Modulating function/ positioner fault finding
16
DIN plug issues
17
Housing Issues
18
Most common causes of ‘malfunctions’
18
Information needed to report a ‘faulty’ actuator
