Autotrol 1000813 12 Volt Plugin Transformer UK Plug

The Autotrol 1000813 is the genuine Pentair 12V AC plug-in transformer for Autotrol 255, 263, 268, 278 and Magnum series valves — one of the most common Autotrol water softener parts we sell. If you've searched "Autotrol transformer replacement", "Autotrol 12V power supply UK" or "water softener display not working", this is the part. Genuine Pentair Autotrol transformer, in stock at WrekinWater.

Technical specifications

Symptoms that mean you need this part

• A blank or dead display on the valve
• The clock has stopped or the time of day keeps resetting to a default
• The softener never initiates a scheduled regeneration
• The valve is frozen in whatever position it was last in

Why it fails / why it matters

This is one of the most common — and least expensive — Autotrol failures, because the transformer runs continuously for years without ever being switched off. When its output drops, the symptoms look exactly like a failed control board, which is why it's worth trying this first: it takes minutes to swap and rules out the far more expensive board as the cause.

Why buy this from WrekinWater

This is genuinely one of our best-selling Autotrol parts — a low-cost, high-confidence first fix that WrekinWater recommends before any more expensive diagnosis, backed by 15 years of experience with exactly this fault. Rated Excellent on Trustpilot, UK stock, UK plug ready to use.

How to fit it

1. Unplug the transformer from the wall socket.
2. Unclip the low-voltage connector from the back of the control board.
3. Fit the new transformer and reconnect the connector.
4. Plug back in and confirm the display lights up, then reset the time of day and check your regeneration schedule, both of which are typically lost during a power interruption.