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1 Flash

A.O. Smith · GNVR-50 ProMax Gas 50 Gal 40,000 BTU ProMax Gas Water Heater with Electronic Ignition

A.O. Smith GNVR-50 ProMax Gas 50 Gal 40,000 BTU ProMax Gas Water Heater with Electronic Ignition 1 Flash Error Fix: Normal Operation

The status light is flashing once, indicating normal operation. No fault is present. The pilot is lit and the gas control valve is functioning correctly. If you are experiencing issues despite a normal status light, check your thermostat setting, hot water demand, and incoming water temperature.

Low severity2 fixes available✨ Free fix available

Quick Answer

Error 1 Flash on the A.O. Smith GNVR-50 ProMax Gas 50 Gal 40,000 BTU ProMax Gas Water Heater with Electronic Ignition means: Normal Operation. The top-ranked community fix is “Inspect and Replace Thermostat or Gas Control Valve” (medium difficulty, ~60 min, DIY cost: $15-$30). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · water heater

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many water heater repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $150-$250.

Other A.O. Smith Models with Error 1 Flash

GCR-40 ProLine 40 Gal 38,000 BTU ProLine Gas Water Heater with Energy Saver

water_heater · 2 fixes

GPVL-50 ProLine XE 50 Gal 38,000 BTU ProLine XE Power Vent Gas Water Heater

water_heater · 2 fixes

GPVT-50 Power Vent 50 Gal 38,000 BTU Power Vent Gas Water Heater with Electronic Ignition

water_heater · 2 fixes

Other A.O. Smith GNVR-50 ProMax Gas 50 Gal 40,000 BTU ProMax Gas Water Heater with Electronic Ignition Error Codes

2 Flashes

Thermopile Voltage Low

2 fixes

4 Flashes

Temperature Exceeded High Limit

2 fixes

5 Flashes

Temperature Sensor Failure

2 fixes

7 Flashes

Gas Control Valve Failure

2 fixes

8 Flashes

Loss of Pilot Signal

2 fixes

People Also Ask About A.O. Smith GNVR-50 ProMax Gas 50 Gal 40,000 BTU ProMax Gas Water Heater with Electronic Ignition Error 1 Flash

What does error code 1 Flash mean on a A.O. Smith GNVR-50 ProMax Gas 50 Gal 40,000 BTU ProMax Gas Water Heater with Electronic Ignition?

Error code 1 Flash on the A.O. Smith GNVR-50 ProMax Gas 50 Gal 40,000 BTU ProMax Gas Water Heater with Electronic Ignition means: Normal Operation. The status light is flashing once, indicating normal operation. No fault is present. The pilot is lit and the gas control valve is functioning correctly. If you are experiencing issues despite a normal status light, check your thermostat setting, hot water demand, and incoming water temperature.

How do I fix error code 1 Flash on my A.O. Smith GNVR-50 ProMax Gas 50 Gal 40,000 BTU ProMax Gas Water Heater with Electronic Ignition?

The most successful fix is "Inspect and Replace Thermostat or Gas Control Valve" (medium difficulty, ~60 minutes). Estimated DIY cost: $15-$30. HomeMD has 2 community-ranked fixes for this error.

Is error code 1 Flash on a A.O. Smith GNVR-50 ProMax Gas 50 Gal 40,000 BTU ProMax Gas Water Heater with Electronic Ignition serious?

This error is rated low severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Can I fix A.O. Smith GNVR-50 ProMax Gas 50 Gal 40,000 BTU ProMax Gas Water Heater with Electronic Ignition error 1 Flash myself?

Yes — the top-ranked community fix ("Inspect and Replace Thermostat or Gas Control Valve") is rated medium difficulty and takes about 60 minutes. Tools needed: Phillips screwdriver, Adjustable wrench, Multimeter.

How much does it cost to repair A.O. Smith GNVR-50 ProMax Gas 50 Gal 40,000 BTU ProMax Gas Water Heater with Electronic Ignition error 1 Flash?

DIY cost: $15-$30. Professional repair typically costs $150-$250. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the A.O. Smith GNVR-50 ProMax Gas 50 Gal 40,000 BTU ProMax Gas Water Heater with Electronic Ignition have?

The A.O. Smith GNVR-50 ProMax Gas 50 Gal 40,000 BTU ProMax Gas Water Heater with Electronic Ignition has 5 other known error codes, including: 2 Flashes (Thermopile Voltage Low), 4 Flashes (Temperature Exceeded High Limit), 5 Flashes (Temperature Sensor Failure), 7 Flashes (Gas Control Valve Failure), 8 Flashes (Loss of Pilot Signal).

Which other A.O. Smith models have the 1 Flash error?

Error code 1 Flash also appears on 3 other A.O. Smith models: GCR-40 ProLine 40 Gal 38,000 BTU ProLine Gas Water Heater with Energy Saver, GPVL-50 ProLine XE 50 Gal 38,000 BTU ProLine XE Power Vent Gas Water Heater, GPVT-50 Power Vent 50 Gal 38,000 BTU Power Vent Gas Water Heater with Electronic Ignition. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the A.O. Smith GNVR-50 ProMax Gas 50 Gal 40,000 BTU ProMax Gas Water Heater with Electronic Ignition have?

The A.O. Smith GNVR-50 ProMax Gas 50 Gal 40,000 BTU ProMax Gas Water Heater with Electronic Ignition has 5 other known error codes:

2 Flashes — Thermopile Voltage Low (2 fixes)
4 Flashes — Temperature Exceeded High Limit (2 fixes)
5 Flashes — Temperature Sensor Failure (2 fixes)
7 Flashes — Gas Control Valve Failure (2 fixes)
8 Flashes — Loss of Pilot Signal (2 fixes)

Which other A.O. Smith models have the 1 Flash error?

Error code 1 Flash also appears on 3 other A.O. Smith models:

GCR-40 ProLine 40 Gal 38,000 BTU ProLine Gas Water Heater with Energy Saver (water heater) · 2 fixes
GPVL-50 ProLine XE 50 Gal 38,000 BTU ProLine XE Power Vent Gas Water Heater (water heater) · 2 fixes
GPVT-50 Power Vent 50 Gal 38,000 BTU Power Vent Gas Water Heater with Electronic Ignition (water heater) · 2 fixes

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