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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.
a) Check for loose or disconnected wires in the electrical box. Before opening electrical
box remove all 115 (220) vac power from boat. See above WARNINGS regarding 115
(220) vac power.
b) If wiring is deemed good, problem will either be a faulty thermal safety fuse or a
faulty heater coil. Usually the thermal fuse is the problem. To replace either item,
remove the metal cover from around the evaporator by removing two screws on each side
and two bracket screws on the top of the evaporator. The evaporator cover will pull
straight up exposing the coil and fuse. Both items can be checked with a continuity
checker. Replace the faulty item and reposition the cover and replace the retaining
screws.
11. No Heat - Reverse Cycle Unit - Compressor And Fan Run:
a) Reversing valve sticking. Tap lightly with handle of screw driver.
b) Reversing valve solenoid loose or wire off. Tighten nut on solenoid and/or secure
wire.
c) Loose wire or faulty reversing valve relay in electrical box. Remove all power to boat
before opening electrical box. See 115 (220) vac WARNING under paragraph 1i)
above. Repair wire and/or replace reversing valve relay.
d) Faulty compressor. Replace compressor. Requires professional service.