Climatemaster - Flashing Code 7

ClimateMaster Heat Pump: Heating / Cooling

Re: Code 7

Code 7 = Under or Over Voltage

• An over/under voltage condition exists when the control voltage is outside the range of 18VAC to 31.5VAC.
• Over/under voltage shut down is a self-resetting safety. If the voltage comes back within range for at least 0.5 seconds, normal operation is restored.
• This is not considered a fault or lockout. If the CXM is in over/under voltage shutdown for 15 minutes, the alarm relay will close.

CHECKOUT:

1. Check Line Voltage

• Check the inlet line voltage.
  • Acceptable range = 200 - 240VAC

2. Check Transformer Wiring

• Most transformers have separate wiring terminals for 208V and 230V.
• Ensure that the transformer is wired properly for the actual inlet voltage.