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My experience is that peltier devices are one of the most commonly misunderstood in the electronics realm. It’s quite difficult to get a grip on the nuances involved without a decent footing in thermodynamics and electronics alike, and it wouldn’t surprise me in the least if the designer(s) of the product in question were a bit light on either.
A key idea is that the nameplate numbers on a peltier device usually only describe two very specific endpoint conditions, and that actual practice usually operates somewhere on a continuum between the two, or below. Operation at ~30 to 50% of nameplate ratings tends to give the most thermal bang for the electrical buck, so running two (electrically) in series rather than one at maximum capacity from a given electrical source would be likely to give a more desirable result.
The posts linked below were an attempt to explain some of the considerations involved in using the darn things effectively. From an “I’m out of warranty and I want to try fixing it” standpoint, finding something with specifications as near to original is perhaps one’s best bet, but in pursuing that avenue one assumes all the risks that attend it.
A pump failure or fluid flow restriction in such a system as I understand it would seem extremely likely to result in failure of a thermoelectric device if the system design does not incorporate suitable protections.
