Cal Spas Heater Pressure Switch, 25 Amp – Replacement
The pressure switch is the small safety switch threaded into the heater tube. It lets the heater turn on only when the pump is moving enough water through it. When the switch fails, a perfectly good heater won’t turn on, so a bad pressure switch often gets mistaken for a bad heater.
This is the pressure switch for the Cal Spas XL 5.5 kW heater, which has a 1/8″ pressure switch tap. It’s a HydroQuip 25 amp, 240V switch that replaces 3010P and 4010P switches. Pair it with the pressure switch harness if your wires or spade connectors are corroded.
Specifications
- Rating: 25 amp, 240V
- Pressure range: 1–11 PSI
- Replaces: 3010P and 4010P pressure switches
- Manufacturer: HydroQuip
What’s in the Box
One pressure switch, as pictured. The wire harness is not included. Reuse the wires from your old switch, or order the Cal Spas pressure switch harness.
Compatibility & Installation
- Match the number on your old switch (3010P or 4010P style) and its 25 amp rating
- Turn off power at the breaker and lower the water below the heater, or close the valves, before you unscrew the old switch
- Seal the threads with Teflon tape, and don’t overtighten the switch into the heater tube
- Move the wires to the new switch the same way they came off the old one
- Check the filter first. A clogged filter lowers the flow and makes a good switch look bad
Common Symptoms of a Bad Pressure Switch
- The heater won’t come on even though the pump runs and the filter is clean
- Flow, pressure-switch or “heater dry” error messages
- The heater shuts off and on in short cycles
- A corroded, cracked or leaking switch body
Related: Cal Spas Heaters | Cal Spas Misc Parts | Cal Spas Filters
Ships from our parts distributor, usually within 1–2 business days. Orders over $99 ship free in the lower 48.
✅ Not Sure It Fits? Verify Before Ordering
Hot tub part compatibility can vary by spa brand, model, year, serial number, control system, and part revision.
To help us identify the correct replacement part, please send clear photos of:
- Your existing part label or sticker
- Your spa serial number sticker
- The equipment area or installation location (if accessible)
EZ Hot Tub Parts can help confirm fitment before you order and help reduce costly returns.
34-0019-D-K 340019DK 34-0019-D 3010P 4010P tecmark pressure switch 25 amp pressure switch cal spa pressure switch hot tub heater pressure switch
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