“24V Limit Error” Control has sensed a lack of 24V on the outlet of the burner relay (B1). Replace Water Sensor if the resistance is not in the correct range. (Note: ER3 will be displayed if temperature sensed is less then 0☏.)Ģ. Check wiring to Water Sensor for open circuits or shorting to ground. “Water Sensor Open Circuit” Control has sensed an open circuit in the Water Sensor circuit.ġ. “Water Sensor Short Circuit” Control has sensed a short circuit in the Water Sensor circuit. If not hot, check for sources of grounding or shorting at the Water Sensor electrical connections, check wiring from Sensor to Boiler (Red) Control.ģ. If the boiler is extremely hot check for adequate water pressure and circulation, contact NTI for assistance.Ģ. “Water Temperature Excessive” Sentry has sensed a water temperature in excess of 250☏ at the Water Sensor.ġ. NTI Matrix M100 boiler error codes Symptom
