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This OEM Carrier transformer (part #HT01BD242) is the factory-specified replacement for the Carrier PH2PEB036000AA packaged heat pump unit. The transformer steps down high-voltage line power (208/240/480V primary) to the 24V AC signal used by your thermostat, contactor coil, and all low-voltage control circuits. When this part fails, the entire control circuit goes dark — the thermostat loses power, no calls for heating or cooling are processed, and the unit sits completely unresponsive. It is one of the first components to check when nothing works.
Compatibility: Designed for the Carrier PH2PEB036000AA packaged heat pump unit. Also cross-references for use in Carrier, Bryant, Tempstar, and ICP family units sharing the HT01BD242 specification. Always verify primary voltage (208/240/480V) and VA rating (75VA) on your unit's data plate before ordering. Not sure it fits? Our parts team confirms fitment before you buy — contact us anytime.