Question about Water Heaters
I have an AO Smith GPS 75 200. Many times a day I find that I have no hot water. The error code I receive is: fist light on, second off, last four are on. I can't find this code in the documentation. If I turn off the power, then turn it back on, the boiler starts heating up again, and I get hot water. However, at some point, for some unknown reason, it goes off again. Any advice is appreciated.
Copy following link for troubleshoot service manuals by type of gas control valve, including instructions for replacing gas control valve:
Perform the required maintenance, and catch unit up to date, and replace gas control,,, might be best to call plumber.
The intellivent gas control valve is removed completely from tank, so tank must be drained.
Posted on May 01, 2013
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Posted on Jan 02, 2017
SOURCE: boiler overheating
the problem there a relay stuck or thermostat bring on the pump & you can lower your high limit aquastat!! also the flow valves can bypass hot hot water risers time to put in a seperate water heater domestic coil are not energy efficient !!!! aquastat high limit set @ 180f deg low limit set @ 140f deg!!!
good luck!!! tim
Posted on Oct 18, 2008
It's got nothing to do with carbon monoxide. CO means the boiler is in combustion test mode, that's all (and in this case -- long since fixed, I imagine, but other people will no doubt find this page in the future -- failing). Vokera could probably have made this clearer, but hey.
Posted on May 14, 2009
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