Mermaid Air Conditioner - Manual (Page 33)

a) Drain pan nipple on pan clogged. Clean nipple.
b) Drain hose clogged, misaligned or kinked. Fix and/or clear hose.
c) Air conditioner not properly elevated to drain water to drain pan nipple. Check unit
mounting to insure water will flow to nipple.
7. Circuit Breaker Will Not Stay On:
a) Shorted wire. See the WARNING under paragraph 1i above regarding electrical
service in and outside of the electrical box and at the circuit breaker. Check for loose or
disconnected wires. Reconnect or replace as necessary.
b) Pump internally shorted. Remove pump power from electrical box and start the unit.
If circuit does not trip, replace pump.
c) Check circuit breaker for proper operation. If faulty, replace circuit breaker.
d) Compressor shorted internally. Compressor must be replaced professionally.
8. High Pressure Switch Activates In Cooling Mode:
a) Only a lack of cooling water will activate the high pressure switch when the air
conditioner is operated in the COOL mode. See paragraph 4 (No Water Out) above.
9. High Pressure Switch Activates In Heating Mode:
a) When the high pressure switch activates in the HEAT mode, the evaporator is not
being properly relieved of heat. This is due to air flow restrictions. Remove the
restriction.
Dirty air filter.
Blocked return air.
Return air grill smaller than specified physical size.
Closed or insufficient number of supply air grills.
Duct runs too long, too many turns or kinks creating a heat back up on the
evaporator.
10. No Heat - Electric Heat Unit - Fan Runs:
Note: Remember that on electric heat models the pump nor the compressor will
run. Only the fan and the heater coil are activated.