R18KT0001 Mortex / Heat Controller CONTROL BOARD

The R18KT0001 Control Board is the primary logic/control module for Heat Controller/Mortex HVAC systems. It receives inputs from limit switches, temperature sensors, and the thermostat, then controls:

• Blower on/off timing

• Heat sequencing

• Safety lockouts

• System shutdown logic

• Communication with sensors and components

It is used in both residential and light‑commercial Heat Controller units, including many Comfort‑Aire and Century branded furnaces and air handlers.

🔧 Cross‑Reference / Replaces

Based on available listings and typical Heat Controller part lineage:

• R18KT0001 (primary OEM)

• Heat Controller OEM Control Board

• Used across multiple Heat Controller furnace families (Comfort‑Aire / Century)

• Compatible with several Mortex‑built systems that used Heat Controller electronics

Common Symptoms This Board Fixes

• Furnace won’t start

• Blower runs continuously

• Intermittent heat or no‑heat

• Sensor communication errors

• Burned components from power surge

🛠️ Installation Notes

• Disconnect power and discharge capacitors

• Label all wiring before removal

• Mount board securely and reconnect per diagram

• Restore power and test full cycle

Heat Controller

R18KT0001