Repairs and replacement - PENN Controls - LIT-12012249 - A421ABT - A421AET - Electronic Temperature Control - A421 Duty‐Cycle/Ventilation Models

A421 Series Electronic Temperature Controls with Cycle Timer Product Bulletin

Product name
A421 Duty‐Cycle/Ventilation Models
Document type
Product Bulletin
Document number
Revision date

Do not attempt to repair or recalibrate the A421 Series Electronic Temperature Control. In case of a defective or improperly functioning control, contact your nearest authorized Johnson Controls® or Penn distributor or sales representative.

When you contact your Johnson Controls or Penn distributor, have the model number of the control available. You can find this number on the label inside the cover of the control.