E03 : No Zone Current

  • Check for tripped circuit breaker on Reactor or at power source of that zone. Replace circuit breaker if it trips habitually.
  •  Check for loose or broken connection at that zone.
  • Exchange zone module with another one. 
  • Turn zone on and check for error. 
  • If error disappears, replace faulty module.
  • If E03 occurs for all zones, the contactor may not be closing. Verify wiring from heater control to contactor coil.