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Navien boiler error E352
Water pressure too high. System pressure is over the limit: failed fill valve or expansion tank.
Serious · needs a technician
E352
Meaning: Water pressure too high
What causes E352
System pressure is over the limit: failed fill valve or expansion tank.
What to do
Do not keep resetting it. The expansion tank and fill valve need checking.
Can I fix it myself?
No. This is a fault a technician should handle; keep using the appliance and it can get worse or become unsafe.
If the code comes back
Book a visit and add the code to the booking. A technician arrives knowing which parts to bring, diagnoses the boiler for a flat $89 and gives you an exact quote before doing any work.
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