Hydro-Quip 34-0201 Gecko 4-pole 3 wire hi limit sensor with 1/4 inch bulbHydro-Quip Gecko 4-Pole 3 Wire Hi Limit Sensor with 1/4 Inch Bulb, 34-0201$7299
Hydro-Quip 34-0201 Gecko 4-pole 3 wire hi limit sensor with 1/4 inch bulb
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Hydro-Quip Gecko 4-Pole 3 Wire Hi Limit Sensor with 1/4 Inch Bulb, 34-0201

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$7299
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Quick overview

  • Gecko 4-pole 3 wire Matched to the Gecko plug style, which is what decides whether a sensor will fit at all.
  • 1/4 inch bulb The sensing bulb diameter, so it seats correctly in the sensor well.
  • 14 inch lead Long enough to reach from the well back to the board on the packs it is used with.
  • Safety device The hi limit is what shuts the heater down before the water gets dangerously hot.
  • Common failure A bad hi limit is a classic cause of nuisance heater lockouts and overheat errors.
  • Hydro-Quip part Ordered by part number 34-0201 rather than by matching a picture.
Full description and specifications ↓

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Product details

The Hydro-Quip 34-0201 is a hi limit sensor for Gecko spa controls. It uses the Gecko 4-pole 3 wire connector, has a 1/4 inch sensing bulb and a 14 inch lead.

What it protects

The hi limit is the safety sensor at the heater. It is not the one that holds your set temperature; its job is to notice when the water at the heater has gone past a safe point and shut the heater down before anything is damaged or anyone is scalded. Because it is a safety device, a spa will refuse to heat rather than run without a working one.

The symptom that leads here

Repeated overheat or hi limit faults on a spa whose water is plainly not hot. A sensor that has drifted out of range or failed open reports a temperature that is not real, and the controller does the safe thing and locks the heater out.

Getting the right one

The connector is what matters most. Count the poles and wires on the sensor you are removing and confirm it is the Gecko 4-pole 3 wire style before ordering.

Specifications
Brand Hydro-Quip
Manufacturer part number 34-0201
Type Hi limit sensor
Connector Gecko 4-pole 3 wire
Bulb diameter 1/4 inch
Length 14 inch
Shipping weight 1 lb
Ships Parcel

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Questions and answers

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

What does a hi limit sensor do?
It watches the water temperature at the heater and cuts the heater off if it climbs past the safe limit. It is a protective device, not the thermostat that sets your normal temperature.
Which packs does it suit?
Spa packs using the Gecko 4-pole 3 wire sensor connection. Check the plug on your existing sensor before ordering, because the pole and wire count is what determines fit.
What are the specifications?
A 1/4 inch sensing bulb on a 14 inch lead, with the Gecko 4-pole 3 wire connector.
My spa keeps tripping an overheat error. Is this the part?
It is one of the first things to check. A hi limit sensor that has drifted or failed will report a false overheat and lock the heater out even though the water is fine.
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