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M
mburgessNov 24, 2025
What to do if Dometic Passport I/O Legacy Marine Equipment unit does not heat?
- WwendypetersonNov 24, 2025
If your Dometic Marine Equipment unit is not heating, here are some possible reasons: * The unit might not have a heating cycle. Most units have a reverse cycle to create heat, but some units may not have this function. * The display could be set to cool-only or electric heat. Change the parameters on the display or press the Mode button to set HEAT or AUTOMATIC. * The reversing valve might be stuck. Lightly tap on the valve with a rubber mallet while the unit is in HEAT mode. Call a service technician if that does not correct the problem. * The seawater temperature might be too low. For the unit to heat (if the reverse-cycle option is available), water temperatures must be 40 °F (4 °C) or higher. * There could be a loss of refrigerant gas. Check the air conditioning unit for a ...
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