De Dietrich Electric motor 7849753

The De Dietrich Electric motor 7849753 is an original spare part for De Dietrich boilers. It drives the combustion air fan, supplying air for combustion and expelling flue gases in room-sealed appliances. In modulating premix burners, the motor speed sets the firing rate, with the burner control varying the speed and the gas valve following. This motor is listed under the De Dietrich brand with catalogue article 336.964.008 and manufacturer code 7849753.

When replacing a motor of this class, you must match the electrical supply voltage and the control mode (mains on/off, PWM, or 0-10 V), as well as the mechanical interface: shaft diameter and length, mounting flange pattern, and direction of rotation. The motor may include a speed feedback sensor (e.g., hall effect or tachometer) used by the control to monitor actual speed; a mismatch can cause an airflow fault lockout. Always verify the motor's electrical rating and mounting before ordering a replacement, and check the fan impeller for cleanliness when the motor is removed.

Typical failures include worn bearings (noise or binding), a failed start capacitor (if single-phase), and loss of speed feedback due to wiring or sensor damage. Deposits on the fan impeller can overload the motor, causing thermal trip or imbalance. When such failures occur, the equipment may exhibit abnormal noise, reduced airflow, or lockout due to airflow faults.