Cause of error code E46

Boiler power supply ground wire is not grounded.

Solution for error code E46

1. Is field grounding conductor connected to High Voltage Terminal Strip 120 VAC (G)? 
Yes: -> 2 
No: Connect ground conductor

2. Disconnect field wiring. Is continuity between field wiring neutral and ground less than 10 ohms?
Yes: Replace Control Module
No: Correct faulty ground conductor