Error code reference

Sub-Zero Refrigerator Error Code H2 LO

Over 1 gallon of water dispensed in 15 minutes, or water valve energized 150 seconds. Dispensing interrupted for 45 minutes.

SourceSub-Zero Classic (formerly Built-In) Enhancements (7040319): After Serial 4380000: Service Manualp. 2-34

Diagnostic procedure

The full H2 LO procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
SD Models: Touch & hold Dispenser LIGHT key for 5 seconds. SID Models: Press Water Paddle 5 times in 20 seconds to bypass dispense interrupt.

SourceSub-Zero Classic (formerly Built-In) Enhancements (7040319): After Serial 4380000: Service Manualp. 2-34

More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
Unlock H2 LO procedure $9.95

Or subscribe: $29/month for all codes plus Max diagnostics, with 70 Max messages a day. Plus applicable tax.

Where this code is documented

2 manuals in the MyPros+ library document this code for Sub-Zero refrigerator.

Models covered by the manuals that document this code

More models are covered than are listed here.

75,000+ service documents · 20,000+ error codes · 100+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass · Plus applicable tax