Pentair MasterTemp Water Pressure Switch In stock$96⁴⁸

Pentair 42001-0060S water pressure switch for MasterTemp heaters

Pentair MasterTemp Water Pressure Switch

Name: Pentair MasterTemp Water Pressure Switch
Brand: Sta-Rite
SKU: STA-151-6251
Price: 96.48 USD
Availability: InStock

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$96⁴⁸

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Quick overview

Proves water flow The pressure switch is the safety that tells the heater there is water moving before it will fire.
Fits two heater families Listed for the Pentair MasterTemp and for the ETi 400 High Efficiency heater.
Part 42001-0060S The factory water pressure switch, not a generic substitute.
Heater water system part Sits in the water side of the heater alongside the thermal regulator and the relief valve.
A common no fire fault A heater that runs the pump but never lights often has a failed or stuck pressure switch.
Direct replacement Swaps in for the original switch during a normal service.

Full description and specifications ↓

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Product details

The Pentair 42001-0060S is the water pressure switch for the MasterTemp heater and the ETi 400 High Efficiency heater. It is part of the heater water system, the group of components on the water side of the heater.

What it does

The pressure switch is a safety. It senses that water is actually moving through the heat exchanger and closes to allow the heater to fire. If it does not close, the heater will not light, which is exactly the behavior you want when flow is low or absent.

The fault it causes

Because it is a gatekeeper, a failed pressure switch presents as a heater that simply will not come on. The pump runs, the filter is clean, the thermostat is calling, and nothing happens. Once flow has been ruled out, the switch is one of the first parts to test.

A note on branding

This part appears in the source data under both the Pentair and Sta-Rite names. The number that matters is 42001-0060S.

Specifications
Brand	Pentair
Manufacturer part number	42001-0060S
UPC	022315210608
Type	Water pressure switch
Fits	Pentair MasterTemp and ETi 400 High Efficiency heaters
System	Heater water system
Also listed under brand	Sta-Rite
Shipping weight	0.1 lb
Ships	Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

What does the water pressure switch do?

It confirms that water is flowing through the heater. Until it closes, the heater will not fire, which is what stops the unit from heating a dry or stagnant exchanger.

Which heaters does it fit?

The Pentair MasterTemp and the ETi 400 High Efficiency heater.

My heater will not fire even though the pump is running. Is this the part?

It is one of the first things to check. If flow is good and the filter is clean but the heater never lights, a pressure switch that has failed or stuck open is a common cause.

Why do some listings show this as a Sta-Rite part?

The part appears under both names in the source data. The part number to match is 42001-0060S.

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