Equipment identification · supplier records
Day & Night HVAC serial number lookup
Identify your Day & Night furnace, air conditioner or heat pump from its rating plate. Check available supplier records for parts and warranty information; product and historical coverage vary. Copy the complete serial and separate model number.
Browse Day & Night manuals and guides →Equipment records
Check parts and warranty information
Request the available supplier record for this serial. Returned replacement parts describe components; they do not identify the complete equipment model.
Find the equipment label
Serial formats
and source limits
Use the field explicitly marked serial number on the equipment data plate. Check the specific model manual for its location; the captured source does not establish one universal position.
The captured equipment records page offers serial lookup but does not publish a fixed serial pattern. Enter the equipment serial exactly as printed, preserving letters and meaningful punctuation.
- Serial dates and format matches do not establish current warranty coverage, purchase date, authenticity or ownership.
- A missing equipment records result does not establish an invalid serial number; manufacturer and model coverage vary.
Source references
Legacy ICP: factory letter, year and week
hvac
Factory letter + YYWW + five sequence digits. Official DLF4/DLC4 service manual gives V102212345, while gas-pack recall gives L004112345. Conservative documented-era coverage 2000-2012. This rule does not assert that every ICP product used it through the present.
Selected D5C ductless models: V year/week
hvac
Model-specific ductless service guide: V YY WW 40000-49999, sequence resets after 49999. Published 2017 example and 2025-hosted service guide; do not interpret V as a factory location. Select/confirm the D5CPRAH or D5CVRAH family.
Selected R-454B models: week/year and site
hvac
2026 ICP R-454B variable-speed service manual prints 0118E00001 using WWYY before plant. Model context is required because this is not an official replacement rule for all legacy ICP products; 2018 is the manual example, not an asserted refrigerant launch year.
Understanding the record
Day & Night lookup questions
Does a returned part identify my equipment model?
A compatible replacement part is a component and can fit several equipment models. An equipment model is shown only if the record explicitly identifies it. You can enter the model printed on your unit to search its manuals independently.
Do warranty dates guarantee free service?
The lookup displays warranty fields available for the serial. Dates alone do not establish entitlement: parts, labor, installation, geography and purchase requirements can differ. Confirm coverage with the manufacturer before arranging service.
Can I share a lookup?
Use “Copy share link” after a lookup. The serial and optional model appear after #serial= in the URL. Anyone with that link can repeat the lookup and see those details.
What if no record is available?
Check letters, leading zeros and meaningful hyphens. Use the manufacturer’s support and model-specific manual. A database coverage gap and a temporary service failure are different results.
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