Charger issue

[Hog]

Hope someone can help me with this?

X-Drive 6 4 way multi charger. Works perfectly well charging my shorty lipos for off road, however I've just started 1/12th oval again and need to charge 4 cell NiMh too.

Changed the settings on the charger to NiMh, set the charge amps to 1C, and away we go. However on 3 of the 4 channels after a few seconds I get a "high voltage error" and charging stops.

These are new packs, and on the 1 channel that still seems to work I have no issue with any of the packs.

Is there a charge parameter that perhaps I've overlooked in the settings that could be causing this to happen?

Thanks in advance.