Johnson Controls A421ABC-02 is a 120/240 VAC Single Stage Electronic Temperature Control. It senses temperature and cycles the heating or cooling circuit to hold the set point. Replacement is usually called for when you are seeing temperatures that overshoot or undershoot the dial, or a unit that runs continuously or not at all.

It also cross-references 5 manufacturer part numbers. Check the number on the part you are replacing, or your unit's model number, against the lists below before ordering.

Supplied as a single replacement unit.

Johnson Control A419ABC-1C Replaced By A421ABC-02C Electronic Temp Control W/ Display, -40 To 212 F, Adj Diff 1 To 30 F, 3 Button Touch Pad, Menu, Up Arrow, Down Arrow. AC Full Load 16 AMP/120V, 9.2 AMP/208V, 8 AMP/240V, Nema 1 Enclosure, SPDT, Temp Sensor W/ 6-1/2 FT. 2 Wire Lead, 1/4" X 2" Bulb. Note: Use Copper Conductors Only. Includes Instructions.

Cross-reference

• Johnson Controls: A419ABC-1, A419ABC-1C, A419ABC1, A419ABC1C, A421ABC-02C

Ordering by part number is the most reliable way to get the right part.