Display is blank or shows “No AC” and the softener does not regenerate.

Safety first: Work carefully around electrical outlets. If you are not comfortable testing live voltage, contact a qualified technician.

• Check outlet: Verify the outlet powering the Hellenbrand transformer has power by plugging in a lamp or tester. Reset any tripped GFCI or breaker.
• Inspect transformer: Ensure the transformer is firmly plugged into the outlet and the low-voltage plug is fully inserted into the control head.
• Test transformer output: With a multimeter set to AC volts, measure the transformer output (typically 12–24 VAC). If there is no or low voltage, replace the transformer with the correct Hellenbrand-rated part.
• Check control head connection: Inspect the low-voltage jack on the control head for corrosion or looseness. Reseat the plug several times.
• Board short check: If a new transformer also fails or gets hot quickly, the control board may be shorted. In that case, replace the control board.