Dsi water heater

[hasheel]

My Atwood 6 gallon gas only water heater, kicks on. But it does not stay on long enough to heat the water sufficiently. Any ideas?

[Old-Biscuit]

Flame MUST engulf spark electrode when it lights off
Spark electrode needs to be clean-----emery/crocus cloth
Ceramic on spark electrode if cracked will allow ground tracking...wipe down using a rag with silicone sprayed on it
Contacts on high tension wire at board or electrode must be clean/tight

Flame has to 'prove' it lit
It does this by flame ionization which actually generates a millivolt signal that goes back to circuit board.if circuit board doesn't get this signal it shuts down gas valve

[Toddupton]

Is there actually any water in it? Did you pull the relief valve and see if water came out.