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An extensive dataset for SN 2003hv that covers the flux evolution frommaximum light to day +786 is presented. The data are combined with publishednebular-phase infrared spectra, and the observations are compared to modellight curves and synthetic nebular spectra. SN 2003hv is a normal Type Iasupernova (SN Ia) with photometric and spectroscopic properties consistent withits rarely observed B-band decline-rate parameter, Delta m_15 = 1.61 +- 0.02.The blueshift of the most isolated [Fe II] lines in the nebular-phase opticalspectrum appears consistent with those observed in the infrared at similarepochs. At late times there is a prevalent color evolution from the opticaltoward the near-infrared bands. We present the latest-ever detection of a SN Iain the near-infrared in Hubble Space Telescope images. The study of theultraviolet/optical/infrared (UVOIR) light curve reveals that a substantialfraction of the flux is "missing" at late times. Between 300-700 days pastmaximum brightness, the UVOIR light curve declines linearly following the decayof radioactive Co56, assuming full and instantaneous positron trapping. At 700days we detect a possible slowdown of the decline in optical bands, mainly inthe V band. The data are incompatible with a dramatic infrared catastrophe.However, the idea that an infrared catastrophe occurred in the densest regionsbefore 350 days can explain the missing flux from the UVOIR wavelengths and theflat-topped profiles in the near-infrared. We argue that such a scenario ispossible if the ejecta are clumpy. The observations suggest that positrons aremost likely trapped in the ejecta.

The normal Type Ia SN 2003hv out to very late phases