Sta-Rite 42001-0063S high limit switch for Max-E-Therm SR-200, SR-333 and SR-400 heatersSta-Rite Max-E-Therm and MasterTemp High Limit Switch, 42001-0063S In stock$7499
Sta-Rite 42001-0063S high limit switch for Max-E-Therm SR-200, SR-333 and SR-400 heaters
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Sta-Rite Max-E-Therm and MasterTemp High Limit Switch, 42001-0063S

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$7499
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Quick overview

  • Genuine Sta-Rite New OEM part 42001-0063S, not an aftermarket switch.
  • Fits Max-E-Therm SR-200, SR-333 and SR-400 The high limit switch for those three Sta-Rite heater models.
  • Also listed for MasterTemp The part appears with the MasterTemp heater electrical system parts as well as the Max-E-Therm range.
  • Safety device A high limit switch is what shuts the heater down when water temperature climbs past the safe ceiling.
  • Electrical system part Sits in the heater electrical system alongside the thermistor, transformer and ignition control.
  • Common failure point A heater that will not fire, or that cuts out when hot, often traces back to a failed high limit switch.
Full description and specifications ↓

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Product details

The Sta-Rite 42001-0063S is the high limit switch for Max-E-Therm SR-200, SR-333 and SR-400 pool heaters. It is a new OEM part. The same switch is also carried with the MasterTemp heater electrical system parts, so it turns up under both heater families.

What it does

The high limit switch is a safety cutout. It watches water temperature and opens the circuit if the heater pushes past the safe ceiling, stopping combustion before anything is damaged. It is doing its job every time the heater runs, which is why it eventually wears out.

Diagnosing it

A heater that fires and then shuts down once it is hot, or one that will not fire at all, often has a failed high limit switch. It sits in the electrical system alongside the thermistor, the transformer and the ignition control module, and it is the cheapest of that group to rule out first.

Specifications
Brand Sta-Rite
Manufacturer part number 42001-0063S
UPC 022315209831
Type High limit switch
Fits Sta-Rite Max-E-Therm SR-200, SR-333, SR-400
Also listed for MasterTemp heater electrical system parts
System Heater electrical system
Condition New OEM part
Shipping weight 0.05 lb
Ships Parcel

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Questions and answers

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

Which heaters does this switch fit?
Sta-Rite lists 42001-0063S for the Max-E-Therm SR-200, SR-333 and SR-400. The same part is also carried with the MasterTemp heater electrical system parts.
What does a high limit switch do?
It is the safety cutout. If water temperature rises past the limit, the switch opens and the heater stops firing rather than continuing to heat.
Is this a genuine Sta-Rite part?
Yes. It is a new OEM Sta-Rite part, number 42001-0063S.
My heater cuts out once it warms up. Is this the part?
It is a common cause. A failing high limit switch will let the heater start and then shut it down as things get hot, so it is worth testing before replacing larger components.
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