Possible causes
- Power supply AC input voltage is not within normal range (140v - 280v)
- Module drive board bus voltage not within normal range (290v - 410v)
Troubleshooting:
- Test the input voltage between L1 & L2 on the primary input.
- If this is not stable and within spec, please call an electrician to correct the problem
- Measure the bus voltage as shown below.
- If the main power is stable and this measurement is incorrect... please contact Arctic Heat Pumps as the drive board may require replacement.