The problem with the Marine Air  pump relays is they can't handle much amperage…and when they fail…The only part that is available is the complete board or the box with it….

A Cruisair PR8X relay is good for up to 8 units and the "Triac" inside that unit is replaceable plus will handle up to 25 amps (All Day)….Not likely to fail in pump duty, and they actually use the same triac for compressor duty…

If your pump is drawing more than the Marine Air 6PRP can handle…It's likely drawing too much anyway, and that may be your first problem, but without info on what it's actually drawing ...]]> Wed, 16 Dec 2009 22:47:00 -0500 http://marine-ac.com/forum/ac-system-controls/pump-relay-panel/#p211 A/C System Controls http://marine-ac.com/forum/ac-system-controls/pump-relay-panel/#p211 I replaced my Marine Air Systems 2-6PRP after noticing that pump ran 24-7 even when all of the 6 systems were switched off. Replacement worked fine but failed after 2 days. Second replacement also failed shortly after installation. I suspect that failure is being caused by the pump, and plan to switch to stand-by pump before installing yet another PRP.

Pump runs only on demand until PRP fails, and then runs 24-7. Question is: Is it usual that failure of PRP will cause 24-7 running of the pump rather than complete failure of the pump to run?

Second question is where can I order my replacement PRP?