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Water Heater Not Heating

No hot water usually means a tripped breaker, pilot out on gas units, or a failed heating element on electric models. Warmlo covers furnaces — for water heaters, call a plumber or HVAC pro; repairs run $150–$600.

Reviewed July 2026

What does water heater not heating mean?

Water heaters are separate from your furnace. Gas units may have a pilot or ignitor issue; electric units use heating elements and thermostats. Check power and the unit's reset button first. These faults don't map to furnace error codes.

What usually causes water heater not heating?

Tripped breaker (electric)most common

Typical repair: $100–$250

Pilot or ignitor failure (gas)common

Typical repair: $100–$250

Failed heating element or thermostatcommon

Typical repair: $100–$250

Find your exact error code

Select your furnace brand to jump to the code page for this symptom.

GoodmanE0Excessive retries or recyclesCarrier14Ignition lockoutRheem10One-hour ignition lockoutLennox200Rollout circuit hard lockoutAmanaE0Excessive retries or recycles

What should I check first when water heater not heating?

  1. Confirm this is a water heater issue, not a furnace issue.
  2. Check the water heater breaker or gas valve.
  3. Press the reset button on electric units if present.
  4. Call a licensed plumber or HVAC tech for water heater repair.

What a repair costs

A thermocouple replacement typically costs between $100 and $250 nationally.

Typical repair cost
$100 – $250thermocouple replacement
Where the money goes
Part $15–$50Labor $50–$235Typical labor time: 0.5–1 hrs

This is general information, not professional advice. Gas, electrical, and combustion repairs can be dangerous — when in doubt, call a licensed technician.