Dometic Blizzard NXT
Official technical documentation and workshop diagnostics for Blizzard NXT.
Technical Specifications
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|
N/A | Unit does not operate Possible Cause: Generator not running or producing power, land line power supply improperly sized or unplugged, or fuse/circuit breaker open or tripped | Verify generator operation, verify land line power connection and sizing, and check/reset fuses or circuit breakers | DIY Safe |
N/A | Frost formation on cooling coil / evaporator icing Possible Cause: Dirty air filter, obstructed air vents, low outside ambient temperatures, or restricted airflow | Inspect and clean dirty air filter, ensure air vents are open and unobstructed, adjust thermostat to a warmer setting counter-clockwise, or run on FAN ONLY setting until frost clears | DIY Safe |
N/A | Coils freezing or improper cooling performance Possible Cause: Inadequate airflow or restricted distribution vents | Ensure a minimum of 2 distribution vents (or the quick cool vent and 1 vent) remain fully open during cool mode operation; check for blocked filters or return air restrictions. | DIY Safe |
N/A | AC power connector failure or loose wires in strain relief housing Possible Cause: Wires extended past insulation stops or connector re-used after closing | Re-terminate wiring using a NEW connector if wires extend past insulation stops or if the housing has been previously closed. | DIY Safe |
N/A | CCC 2 thermostat does not recognize updated dip switch selections Possible Cause: System reset was not performed after changing dip switch settings | Ensure thermostat is in OFF mode, simultaneously press MODE and ZONE buttons until LCD displays 'IniT' and all available zones, release buttons, and press ON/OFF to exit. | DIY Safe |
N/A | Water intrusion into the interior living space of the motorhome through ducting and return air grille/ducting Possible Cause: High static pressures, air flow restrictions, inaccurate installation, unsealed mounting holes, missing foam blocks over drain holes, collapsed ducts, or unsealed plumbing/wire penetrations | Apply silicone sealant to unused mounting holes (pre-2016 models), ensure mounting lag screws are sealed, verify foam roof-gasket blocks are under mounting holes, install foam cover blocks over drain holes using kit no. 3316781.000, inspect and repair/replace collapsed ducts, secure control box wires to prevent airflow restriction, seal all holes around plumbing tubes and wires with sealing putty, apply sealant tape to ducts, and ensure condensation drain holes are free of debris. | DIY Safe |
N/A | Water leaks inside the motorhome or roof condensation. Possible Cause: Roof gasket under-tightened or over-tightened, creating low points or poor seal. | Ensure 4 mounting bolts are torqued uniformly to 40-50 lb-in (4.5-5 N-m) to compress the roof gasket to approximately 1.90 cm (3/4 in). | DIY Safe |
N/A | Features do not work after installation (Fan, Cooling, Heating, Furnace) Possible Cause: Incorrect wiring, improper communication cable termination, or incorrect dip switch configuration. | Disconnect 120 Vac and 12 Vdc power supplies, verify all wiring connections, confirm RJ-11-6C4P pinouts, ensure correct dip switches are set to ON, and perform a system reset. | DIY Safe |
N/A | Rapid compressor cycling, reduced performance, or power supply overload. Possible Cause: Improperly installed or missing divider in the return air cavity allowing cold discharged air to leak into the return air stream. | Ensure the divider is firmly pushed against the base and sealed with double-sided tape and foam insulation without blocking the product data plate. | DIY Safe |
Frequently Asked Questions
Q: MY ROOFTOP UNIT HAS THE ELECTRIC HEAT STRIP OPTION (NON-HEAT PUMP ELECTRIC HEAT OPTION), BUT WHEN IT GETS COLDER OUTSIDE IT DOESN’T SEEM TO MAINTAIN THE TEMPERATURE. WHAT SHOULD I DO?
Electric heat strips are designed to take the chill out of the air inside your motorhome, but they are not intended to be the primary heat source for cold weather camping. When outdoor temperatures drop significantly, the heat loss of the motorhome typically exceeds the capacity of a standard electric heat strip.
Q: WHAT ARE THE BENEFITS OF A MOTORHOME AIR CONDITIONER?
An motorhome air conditioner helps maintain a comfortable indoor climate, reduces humidity levels inside the vehicle, and filters out dust and pollen, creating a more pleasant and healthy living space while traveling or camping.
Q: WHAT IS THE IDEAL AIR CONDITIONING TEMPERATURE?
The ideal indoor air conditioning temperature for an motorhome is generally between 70°F and 72°F (21°C to 22°C), balancing comfort and energy efficiency.
Q: WHAT MOTORHOME AC DO I NEED IN WARM LOCATIONS?
For extremely warm locations or larger motorhomes, a high-capacity rooftop air conditioner (such as a 13,500 BTU or 15,000 BTU unit) or a dual AC setup is recommended to adequately cool the space.
Q: HOW DOES MOTORHOME AIR CONDITIONING WORK?
Motorhome air conditioning works on the same principle as a standard home AC unit. It uses a refrigeration cycle involving a compressor, condenser, expansion valve, and evaporator to absorb heat from the interior air and exhaust it outside, while blowing cooled air back into the motorhome.
Q: HOW TO RUN MY MOTORHOME AC WITH A GENERATOR?
To run your motorhome air conditioner with a generator, ensure the generator has sufficient running and starting wattage (surge wattage) to handle the compressor's startup load—typically a minimum of 2,000 to 3,000 watts depending on the AC unit size. Always start the generator and let it stabilize before turning on the air conditioner.
Q: HOW TO RUN MY MOTORHOME AIR CONDITIONER ON THE CAMPSITE?
To run your motorhome air conditioner at a campsite, connect your motorhome to an appropriate power pedestal (usually 30-amp or 50-amp service) matching your motorhomes electrical system requirements. Ensure other high-draw appliances are managed to avoid tripping the campsite breaker.