Webasto Air Conditioner in 2022 C24 Not Cooling or Heating

JBfishon

Member
Joined
Jan 29, 2025
Messages
11
Fluid Motion Model
C-24 C
Hull Identification Number
FML24C38D222
Vessel Name
Puffin
New to me 2022 C24. Couldn't get Webasto FCFP 10000 A/C working (E1 error). Research points to priming issue. At the dock, in the water, I primed pump in cockpit locker with dock hose, and immediately had water flowing from the port-side A/C discharge. Now primed, reconnected pump hose to thruhull strainer. Turned on A/C (pump running, raw water discharge flowing), set COOL mode with temp set at 62 degrees, and ran the unit for a good 15 minutes. The output tube from the reverse valve going to the evaporator tubes was slightly cooler to the touch than ambient air temp of 74 degrees, as was the air flow from vents. Turned to HEAT mode set at 85 degrees, ran for 15 minutes, and reverse valve tube to evaporator was hot the the touch, but air flow from vents was only slightly warmer than ambient temp.

My question is, did I run the A/C long enough (15 minutes) to get expected results. In COOL mode, I would expect the evaporator tubes to be cold and icing up within that 15 minute cycle. Is this an indication that the A/C unit may have a refrigerant leak and needs to be recharged? Original owner purchased boat new and was used in Maine were A/C might not have even been used. I have no history whether this A/C unit was ever working.
 
My C24 takes quite a while until you can feel a difference in temperature.
Ken
 
My C24 takes quite a while until you can feel a difference in temperature.
Ken
 
The only time my AC ever pulled any code was when it had a burned up capacitor. The unit doesn’t have a charging port so you will have to install your own. I installed one on mine thinking it was low on Freon but it wasn’t low then I discovered the bad capacitor.
 
Per the Wabasto manual E1 is high head pressure (water flow) which you have addressed. The manual also recommends an acid flush on the condenser annually or so. This could cause reduced performance.
 
Thanks, I'll give the acid flush (Acid Magic) a shot.
John...
 
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