The Hayward HDFS400 pool heater recall covers about 4,600 Hayward-branded Universal-HC Series 400,000-BTU gas pool heaters after the U.S. Consumer Product Safety Commission said affected heaters can produce high levels of carbon monoxide during operation.
If your heater is an HDFS400, CPSC says to stop using it immediately and contact Hayward to arrange a free in-home inspection and repair by a qualified technician. The remedy is repair; the reviewed recall notice does not describe a refund or replacement program.
CPSC says the name plate is located below the vent on the heater.
Look for HDFS400 at the top of the name plate. That is the model identified in the recall notice.
Do not continue normal operation while waiting for the recall remedy.
Arrange the free in-home inspection and repair through Hayward rather than treating this as ordinary maintenance.
The heaters were sold from March through July 2026, but the model identifier is the stronger verification point supplied by CPSC.
Check current CPSC and Hayward guidance in case the affected scope, incident status or remedy changes.
Which heater is included in the Hayward HDFS400 pool heater recall?
CPSC identifies the recalled product as the Hayward HDFS400 Universal-HC Series, a 400,000-BTU dual-fuel gas pool heater. The recall notice says about 4,600 units are affected.
The model number matters because the recall should not be broadened to every Hayward pool heater. The reviewed CPSC notice specifically identifies HDFS400. TPS did not find a published serial-number subrange or a separate manufacture-date range that narrows the recall further.
How do you check whether your heater is HDFS400?
CPSC says the heater’s name plate is located below the vent. The model number HDFS400 appears at the top of that name plate.
For an owner standing in front of an installed heater, that model check is more useful than relying on appearance alone. The sale period can provide supporting context, but it should not replace model verification.
When were the recalled heaters sold?
CPSC says the affected heaters were sold nationwide through pool-equipment distributors, builders and service professionals from March through July 2026 for about $5,600.
A purchase during that period does not by itself prove that a heater is covered. Check the name plate for HDFS400.
Why were the heaters recalled?
CPSC says the affected heaters can produce high levels of carbon monoxide during operation, creating a risk of serious injury or death from carbon-monoxide poisoning.
The reviewed recall notice does not explain the specific internal component, combustion condition or engineering defect responsible for the elevated carbon-monoxide output. TPS therefore does not assign a technical cause that the regulator has not published.
What should owners do now?
If the heater is HDFS400, stop using it immediately and contact Hayward for the recall remedy.
CPSC says Hayward will provide a free in-home inspection and repair by a qualified technician. This is different from routine troubleshooting or arranging an unrelated repair independently.
Hayward can be contacted at 855-500-5288, Monday through Friday from 8 a.m. to 5 p.m. Eastern Time, or by email at HeaterInquiry@Hayward.com, according to the CPSC recall notice.
Should you return the heater to the store?
The current CPSC remedy does not instruct owners to return the heater to a retailer. The stated remedy is a free in-home inspection and repair coordinated through Hayward.
Owners should follow the current recall process rather than assume that a refund, replacement or retailer return is available.
Can you keep using the heater until the inspection?
CPSC’s instruction is to stop using the recalled heater immediately. The notice does not provide an exception allowing continued operation while an inspection appointment is pending.
That distinction matters because this is not simply a notice to schedule preventive maintenance at a convenient time. The regulator’s current remedy begins with stopping use.
Have any injuries or incidents been reported?
CPSC reported no incidents and no injuries as of the recall notice.
That status should not be interpreted to mean the hazard is theoretical or that continued operation is safe. The recall was issued because of the potential for dangerous carbon-monoxide levels during use.
Are all Hayward Universal-HC pool heaters recalled?
The reviewed notice identifies the HDFS400 400,000-BTU Universal-HC Series model. TPS does not have evidence from the reviewed recall notice to state that every Universal-HC size or every Hayward pool heater is covered.
If your heater shows a different model number, verify it against the current CPSC and Hayward recall information rather than assuming that it is either included or excluded based only on the product family name.
What remains unknown?
- CPSC’s reviewed notice does not publish a narrower serial-number subset within HDFS400.
- The specific technical defect causing elevated carbon-monoxide output is not explained in the notice.
- The notice does not identify the precise repair parts or repair procedure that the qualified technician will use.
- Incident and injury status can change if later reports are received.
What should owners watch next?
The main reasons to recheck this recall are a change in affected-model scope, new serial or manufacture-date guidance, a revised remedy, additional repair instructions, or new incident or injury reports.
Until then, the key owner task is straightforward: verify the model, stop using an affected HDFS400 and arrange Hayward’s free inspection and repair.
Verification note
ThePulseSignal reviewed the current CPSC recall notice for the affected model, product-identification instructions, carbon-monoxide hazard, unit count, sale period, immediate stop-use instruction, free repair remedy and reported incident status. Where CPSC did not publish a technical cause or narrower serial-number range, those points remain explicitly unresolved.
