Replacement Cold Thermostat for Vertex PWC-400 PureWaterCooler

Restore steady cold water in minutes

• Fixes “too warm/too cold” water by replacing the worn cold‑control.
• Replacement part for the PWC‑400—no guessing on wiring or capillary length.
• Pre‑assembled sensing bulb & capillary for quick swap and reliable cycling.

In the Box & Installation

• Included: (1) CL4‑9531 cold thermostat with attached capillary/bulb;

• Install (summary):

1. 1. Unplug the cooler; shut off water.
   2. Remove access panel; note thermostat wiring.
   3. Gently withdraw sensing bulb from the cold‑tank well; avoid bending sharply.
   4. Install the new thermostat; place bulb fully into the well (good contact).
   5. Reconnect wiring; set dial to mid‑range; reassemble.
   6. Restore power/water; allow 15–30 min for temperature to stabilize; adjust as needed.

FAQs

Is CL4‑9531 the correct thermostat for every PWC model?
No, CL4‑9531 is for the PWC‑400 cold circuit. Other models (PWC‑1000/1500/3500, etc.) use different controls. Please contact us with your model/serial.

What symptoms point to a bad cold thermostat?
Water stays warm, compressor never turns on, or runs continuously and ices the tank/coil. If wiring and charge are OK, the cold control is often the fix.

Do I need sealant on the sensing bulb?
Use the factory method (bulb fully seated in the well). If your unit used thermal paste or a clip, reuse/replace per Replacement instructions.

Need help now?

Call 1-800-237-9199, start a live chat, request a call back, or contact us