Mermaid Air Conditioner - Manual (Page 32)

a) Place thermostat in the OFF position. Use a shorting wire as described in paragraph
1h above, except this time short the "RED" wire to the "GREEN" wire. If fan comes on,
thermostat is faulty.
b) If fan does not come on when jumper is applied, it is most likely a faulty fan relay
inside the electrical box or an external fan capacitor. Replace the fan relay or capacitor
with the recommended from the factory. Before opening the electrical box, all 115 (220)
power must be removed from the boat. See the above Note and WARNING under
paragraph 1i) regarding opening the electrical box.
4. No Water Out:
a) Put thermostat in OFF position.
b) Check that sea cock is open. If closed, open and prime pump.
c) Check raw water strainer. If dirty, clean and prime pump.
d) Check that pump is running. If pump is faulty, replace and prime.
e) Check for any obstructions in the intake or strainer/water lines. Periodic growth of
barnicles or accumulated debris may block the water intakes.
f) If this is a new installation, check to make sure that pump, water strainer and sea cock
are all below sea level. Pump will not prime if any of these parts are above sea level.
Also ensure the caps have been removed from the water (condensing) coil.
5. Evaporator Freezing:
a) Supply air vents closed or insufficient number of vents. Open and/or add additional
vents.
b) Fan not running or intermittent. See paragraph 3 above.
c) Return air blocked. Clean air filter and/or remove any blockage.
d) Thermostat set too low and is not allowing unit to cycle and remove icing. Set
thermostat at a higher setting.
e.) Thermostat improperly located in a position not giving “true” cabin temperature.
Examples would be in a sunny spot near glass, or near the hatch. Relocate thermostat.
f) Low freon due to leak. Unit will require professional service.
6. Condensation Pan Overflows: