Failure Codes/Level Display

Level 1-Failure Code Values (Intermittent Wipe Button LED):

NOTE: The DRB III may be used to access limited HVAC control head diagnostic information over the Programmable Communications Interface (PCI) bus.

WIPE BUTTON LED
Level = Display
1 = Failure Codes
2 = Mode Potentiometer test
3 = Blend/Pass, Potentiometer Test
4 = Evaporator Probe (A/C and Zone Units only)
5 = Driver Potentiometer (Zone Units only)

Failure Codes/Level are displayed using the REAR WIPER and INTERMITTENT LED's flashing in the sequence indicated below. The REAR WIPER LED represents the Level and the INTERMITTENT LED represents the Value. After Calibration/Diagnostics is completed, the control will begin flashing Level 1 codes. Depressing the WASH button will cycle to Level 2, depressing WASH again will cycle to Level 3. Each time the WASH button is depressed will cycle to the next level. After Level 5 is reached, you will cycle back to Level 1. If the Control is a Heater Only you will only cycle from Levels 1 to 3.