Is it connected to an antenna and if so what kind and how much sky can it see above it? If you're using a patch antenna, you may have better luck if the antenna is attached to some flat horizontally level piece of metal at least the size of a CD/DVD, preferably larger.
That is basically essential for good performance with a patch antenna.
Also, if it can be commanded to do a survey, has it gotten to do a survey yet? Does it have a 3D lock on at least 3 satellites? It needs a good signal - a good sky view, to lock on to satellites.
Is your antenna outdoors? If it is and its not waterproof, you should try it using another antenna. TAPR sells a pretty good basic GPS antenna for $10. But it needs to be placed on a flat metal ground plane, oriented in the horizontal plane, ideally in a window sill (although a cold window sill above a heating vent or radiator is not a good place for a GPSDO because of large temperature fluctuations.)
Find a good place for your antenna thats dry and place the GPSDO in an area not subjected to extremes of heat or cold.
The GPSDO will always be fairly warm because of its ovened oscillator, thats normal.