Stop using the heater; do not run it to look for a problem
On September 17, 2026, the U.S. Consumer Product Safety Commission announced a recall of about 4,600 Hayward Universal-HC pool heaters. CPSC says the recalled heaters can produce high levels of carbon monoxide during operation, creating a risk of serious injury or death. No incidents or injuries had been reported in the recall notice. That reported count does not make continued use a safe test and does not predict that every covered heater has already released carbon monoxide.
CPSC and Hayward instruct consumers to stop using the pool heater immediately. Do not turn it on to check the exhaust, hold a detector near the vent, remove a panel or attempt combustion, fuel or venting work. Carbon monoxide is colorless and odorless, so the absence of a smell or alarm does not clear the heater. If a carbon-monoxide alarm sounds or anyone has headache, dizziness, weakness, upset stomach, vomiting, chest pain or confusion, move outdoors to fresh air, contact 911 and follow emergency instructions; do not re-enter to inspect the equipment.
Match the HDFS400 model on the nameplate below the vent
This notice covers the Hayward-branded HDFS400 Universal-HC Series pool heater: a 400,000 BTU dual-fuel gas model. CPSC describes it as a brown heater with a black top, a digital control panel at the top and a molded base with tie-down connections. Appearance is only a screening clue. The decisive published identifier is model HDFS400, shown at the top of the heater's nameplate below the vent; Hayward appears at the bottom of that plate.
Photograph the full nameplate only while the heater is off and it is safe to approach. Do not remove the vent, access covers or fuel components to find an identifier. Keep the purchase invoice, installation record and installer information if available. 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. Purchase timing or price alone cannot confirm coverage, and this recall notice should not be generalized to other Hayward models.
Contact Hayward for the free in-home inspection and repair
Contact Hayward Industries at 855-500-5288, Monday through Friday from 8 a.m. to 5 p.m. Eastern Time, email HeaterInquiry@Hayward.com, or use the manufacturer's official recall page. Start from the CPSC notice or Hayward.com rather than an unsolicited message. Provide the exact model and requested ownership details, then record the date, representative, case number and written scheduling instructions.
The published remedy is a free in-home inspection and repair by a qualified technician. Registration is not the repair, and a normal-looking heater is not a completed remedy. Do not buy an unverified kit, hire someone to bypass the recall process or resume operation until Hayward's assigned process confirms the work is complete. Ask the technician to document the inspection findings, corrective work, post-repair checks and completion date. Hayward's current case-specific instructions control if they change after this article's review date.
Use carbon-monoxide alarms as a backup, not permission to operate
CDC recommends battery-operated or battery-backup carbon-monoxide detectors near every sleeping area and annual service by a qualified technician for gas, oil or coal-burning appliances. CPSC recommends CO alarms on every level and outside sleeping areas, following the alarm manufacturer's placement and replacement instructions. Those layers matter across the home, but neither agency presents an alarm as a substitute for stopping use of a recalled appliance or completing its remedy.
After Hayward closes the repair, save the model, nameplate photo, case number, technician, work order, inspection results and completion date in Project Passport. If anyone experienced symptoms or the heater produced an unsafe event, prioritize medical and emergency guidance and report the product incident through SaferProducts.gov after immediate safety is addressed. CoolCompare can organize the official steps and records; it cannot confirm recall eligibility, inspect combustion or venting, authorize the repair or replace CPSC, Hayward, emergency services or a qualified technician.
Sources and further reading
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