Hayward H-Series Heater 135F Hi-Limit | HAXHLI1930
Hayward Products
SKU: HAXHLI1930
Hayward HAXHLI1930 Hi-Limit Switch (135°F) for H-Series Pool Heaters
The Hayward HAXHLI1930 is a genuine OEM 135°F high limit switch (hi-limit) used on compatible Hayward H-Series pool and spa heaters. This safety switch helps protect the heater by shutting the unit down if internal water temperature rises above the safe limit—commonly due to low water flow, blocked circulation, or scaling.
Fits / Compatibility
- Commonly used on Hayward H-Series ED1 and ED2 style heaters
- Also commonly listed for Hayward H-Series Induced Draft and Low NOx heater applications (model/revision dependent)
- Works as the 135°F hi-limit device (verify the temperature rating printed on your existing switch)
Fit tip: Heater parts can vary by revision. Confirm your heater model number from the data plate and match the hi-limit temperature rating before ordering.
What It Fixes
- Heater shutting down on high-limit safety due to a failed or out-of-spec switch
- Intermittent heating caused by unstable switch contact
- Preventive replacement during heater service when the original switch is corroded or damaged
Common Causes of High-Limit Trips (Before Replacing Parts)
- Dirty filter or clogged pump basket reducing flow
- Closed/partially closed valves or bypass settings restricting circulation
- Low water level or suction-side air leak causing poor flow
- Scale buildup inside the heat exchanger creating localized overheating
Specs (Quick Reference)
- Part Number: HAXHLI1930
- Type: Hi-Limit Safety Switch
- Trip Temperature: 135°F
- Part Type: Heater Parts
- Pool Type: In-Ground
Installation Notes
- Power off the heater at the breaker before service.
- Label or photograph wire locations before disconnecting.
- If the heater continues to trip a new hi-limit, diagnose the root cause (flow restriction, scaling, bypass, pump performance) to prevent repeat shutdowns.
- Installation should be performed by a qualified technician.
Related Products
- Hayward HAXHLI1930 Hi-Limit Switch (search)
- Hayward HAXPSA1930 Water Pressure Switch Assembly (search)
- Hayward HAXHOR1930 Header O-Ring (search)
- Hayward HAXNNO1930 Heater Union/Nipple Kit (search)
- Hayward H-Series Heater Parts (search)
Maintenance Tips
- If you see repeated hi-limit shutdowns, check filter pressure and clean/ backwash as needed—low flow is the most common cause.
- Maintain balanced water chemistry to reduce scale that can overheat the heat exchanger.
- Verify proper bypass/valve settings after any plumbing changes to keep heater flow within its required range.
- Keep the heater cabinet clean and ensure ventilation is not blocked.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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