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Using the M31 PAndromeda Cepheid sample and the HST PHAT data we obtain thelargest Cepheid sample in M31 with HST data in four bands. For our analysis weconsider three samples: A very homogeneous sample of Cepheids based on thePAndromeda data, the mean magnitude corrected PAndromeda sample and a samplecomplementing the PAndromeda sample with Cepheids from literature. The latterresults in the largest catalog with 522 fundamental mode (FM) Cepheids and 102first overtone (FO) Cepheids with F160W and F110W data and 559 FM Cepheids and111 FO Cepheids with F814W and F475W data. The obtained dispersion of thePeriod-Luminosity relations (PLRs) is very small (e.g. 0.138 mag in the F160Wsample I PLR). We find no broken slope in the PLRs when analyzing our entiresample, but we do identify a subsample of Cepheids that causes the brokenslope. However, this effect only shows when the number of this Cepheid typemakes up a significant fraction of the total sample. We also analyze the sampleselection effect on the Hubble constant.

M31 PAndromeda Cepheid sample observed in four HST bands