Other tankless

Fogatti InstaShower

About 55,000 BTU, about 2.9 GPM, set about 95 to 123 F. Inlet water about 150 PSI maximum, use a pressure regulator. If hot and cold are reversed it will not respond to flow.

Read the code chart on the lid label or in the manual and match the letters exactly. The checks in TANKLESS: START FIRST find most faults: 12V, LP pressure, flow, vent and plumbing.

Suburban Nautilus

A direct spark tankless. The board runs the same sequence: flow, blower, spark, gas, flame, temperature trim. Use the maker's code chart on the unit or in the manual.

Any other tankless

Model and serial from the label written down

Code written exactly as shown, plus any blink pattern

12V at the board under load

Gas pressure while burning

Flow test with a one gallon jug

Vent and intake clear

Hot and cold not reversed

Many brands buy the same Girard or Chinese-made heater inside. Look at the label and at the board. If the board looks like a Girard board, the Girard checks apply, but still confirm against the manual.

Take a photo of the data label and the code. Warranty companies want both.