No Hot water from A.O Smith GPSH/GPCR Gas Water Heater

Old 03-07-12, 05:07 PM
Thread Starter
Join Date: Mar 2012
Location: USA
Posts: 1
Upvotes: 0
Received 0 Upvotes on 0 Posts
Exclamation No Hot water from A.O Smith GPSH/GPCR Gas Water Heater


I have a 6 yr old A.O. Smith GPSH/GPCR Power Vented Gas Water Heater.

This morning, I saw that there was no hot water running in my house, so, went downstairs to check the heater. The following LEDs were on:

1. First LED that has a label VAC -- It's green.
2. Third LED that has a triangular symbol -- Amber.
3. LED marked C -- Amber.

Looked up the manual, it says the Pressure switch remained open longer than 5 seconds after the combustion blower was energized.

Under the Solution section, found the following:

1. Pressure switch wiring incorrect.
2. Pressure switch tubing is not connected correctly
3. Air intake or exhaust obstructed.

I wonder what this means? Any thoughts / Suggestions on how to fix this?
Old 03-07-12, 07:39 PM
Join Date: Oct 2011
Location: USA
Posts: 41
Upvotes: 0
Received 0 Upvotes on 0 Posts
Don't take this wrong because I'm only trying to help... :-)

Have you tried googling "A.O Smith GPSH/GPCR Gas Water Heater"

I did and found this on Google, a couple of relevant pdf help files came up that included troubleshooting info. Might even hook up with a link to the manufacturer because what you're asking sounds pretty specific to that particular unit.

Old 03-07-12, 08:22 PM
lawrosa's Avatar
Super Moderator
Join Date: Dec 2010
Location: Galivants Ferry SC USA
Posts: 15,997
Received 85 Upvotes on 77 Posts
May still be under warranty.

Whats the serial # of the unit? I will check for you.

If it is you would only have to pay labor.

Otherwise the fan assembly needs to be checked for several things. Check pressure switch, tube to pressure switch, barb fitting where tube goes to on fan may be clogged with condensate mineral build up, fan cfm may have weakened, or vent blocked where it exits the house.

All and all even though thats the failure code it gave it could be something else. Wire harness from fan to gas valve sometimes fail...etc

Mike NJ

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: