Honeywell HSS-DPS sensor is faulty - attachments 1 & 2

Replace with Sontay Condensation Prevention Switch - attachments 3 & 4

Wiring

      Honeywell             Sontay
      V+(*) red             V+(*) red
      GND   blue            0V    blue
      COM   green           COM   black
      DRY   yellow          N/O   yellow

Honeywell V+ 24V ac/dc +/- 20%
Sontay V+ 24V dc +/-5%, 24V ac +/-10%

V+ measured as +16.5V dc with DMM

Interlock still not working

- V value too low ?
- Honeywell DRY not equivalent to Normally Open ?