Applicable Systems
Steam Trap
Symptoms
The Steam Trap reports a main contactor fault. The main contactor failed to close or open as expected during the power-on sequence.
Possible Causes
- Main contactor coil failure or control circuit fault
- Contactor contacts welded or excessively worn
- Contactor control wiring loose or disconnected
Troubleshooting Steps
- Step 1: Check the contactor coil voltage and continuity in the drive
Coil receives correct voltage and has proper resistance - Step 2: Inspect the contactor contacts for welding or excessive wear
Contacts are clean and make proper contact - Step 3: Verify the contactor control wiring is intact and connected
Control wiring is properly connected
How to Reset
To reset: Fix or replace the main contactor, then reset and restart.
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Source: Spirax Sarco Steam System Manual, Spirax Sarco Limited
Category: Boiler
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