Question about Goodman GMS90703BXA Heater

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Condensation in heater box area

Heater not working. Per repairman circuit (pc) board needs replacement. He noticed a puddle of water accumulating underneath the circuit board which may be the cause of this problem. What could cause the condensation in the heater box area? The unit is stationed in the attic area of the garage in a single-story house. The model is Goodman GMP050-3 Serial number 9408120443.

Thank you.

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  • rver2go Dec 21, 2008

    Not really, but I'll try it out.



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Condensation from the outside air is getting into unit! Either the condensation pump is broken or the air intake has a leak and water is getting in through there!

Posted on Dec 19, 2008

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Condensation is being formed somewhere else and probably leaking into the heater box, apply some foam to the box to stop condensation.

Posted on Dec 19, 2008


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Why would my floor board on the drivers side have a puddle of water? I did just replace a heater core. i thought that would solve the problem.

So you're saying you replaced the heater core because water was puddling on the driver's side, but water is still puddling on the driver's side? I'm assuming you're in the US and the driver's side is on the left and the heater core is on the right side.
Do you get much rain where you live? Is the vehicle parked outside? Do you notice the puddling more often after a rain? If this is the case, your water intrusion may be because of a leaking seal around the windshield or door. Check by getting the floor reasonably dry, and then have someone sit inside while another floods your car with a garden hose - specifically the windshield and driver's door. Have the inside observer try to catch a stream of water along the edge of the windshield, along the door jam, or along the door sill.

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Last night I was driving my car and stopped at a gas station to use the restroom. When I got back into the car I notice that there was a large puddle of water on the drivers side floor and behind the...

it is safe, the A/C drain is plugged, if you open the hood and look at the passenger side of the firewall just below were the A/C lines go threw the fire wall you will see a small rubber boot pull the boot off the nipple and use a small wire to clean out the nipple i have even used a tooth pick to clear the blockage, most likely you have a leaf or a-corn blocking the passage, stop parking under the trees, the air inlet for this car is at the back of the hood and junk gets into the heater/A/C box threw this air inlet.

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Can't get any hot water, tried the breaker, tried unplugging and plugging it back in. Out of options other than calling a plumber in to take a look.

If this is 240V electric tankless, make sure unit is getting 240V.
Circuit can test for electricity if just one leg of 240V circuit is on, but the other leg is not.

All costs are energy.
Find a plumber trained in that specific brand of tankless.
Read manual completely several times, and make sure maintenance is done on yearly basis.
Read troubleshoot section completely.
Manual should have phone number of manufacturer.
Call manufacturer for name of trained service technician in your area.

Before installing tankless, make sure trained person is available in area.
This will give insurance that tankless can be successfully maintained, and it will help economy since tankless problems can go on, especially as unit ages.

Tankless should be de-limed each year.
Tankless cannot be exposed to more than 11 grains hardness in the water.
Water pressure, water flow, water quality, air quality, air supply, gas supply, venting, internal parts such as filters, washers, circuit board, dripping condensation are all causes of tankless failure and problems can be combination of several factors.
Problems can be simple or complicated.

Install tank type heater as back up for those days when tankless is not working.

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

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I have a 50 gallon Richmond Power vent water heater. The burner would try to light but would not. I replaced the vacuum switch, but this did not solve the issue. The tygon tube that runs from the vacuum...

The accumulation of condensation in the vent piping is more than likly the problem. I am guessing the vent piping is either 3-inch or 2-inch. You need to splice in a "T" fitting reduced down to 3/4-inch with a 3/4-inch tubing attached and run this to a sutible drain. This will drain the condensation elimiating the accumulation in the vent assembly. Install this "T" fitting about 3-feet down stream from the vent motor.These supples and fittings can be found at a Home Depot or Lowes store.

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Is the lower element suppose to have two legs of 120 to it? Or do i need to move a wire up top to make it 240? as it is on top element.

You have water heater with two elements.
Two-element water heaters are 240Volts.

1) Lets talk about what makes a 240Volt circuit
See basic water heater circuit:

Open link, and illustration at top of page is your water heater circuit

Notice that two insulated wires come from the circuit breaker and go to the water heater.
These two wires are 120volt each. When these two 120Volt wires combine, they create 240Volts
These are called hot wires because they come from the hot busbars.
There is also a bare copper wire that comes from neutral busbar.
The bare copper wire is a safeguard, and is not necessary for the 240V circuit to work.

Inside each circuit breaker box is 1 neutral busbar, and 2 hot busbars.
Open image below, and it shows typical residential breaker box

In a residential home, each circuit takes two wires to complete the circuit.
For 120Volt circuit, you need 1 neutral wire and 1 hot wire to complete the circuit. These are usually a black and white wire. The bare copper wire is a safeguard.
For 240Volt circuit, you need 2 hot wires to complete the circuit, and each hot wire comes off a different busbar. These can be a black and white wire, and sometimes a black and red wire. The bare copper wire is a safeguard.

With a 240Volt water heater the two hot wires connect to the black and red wires located on top of water heater.

2) Let's talk about wiring inside a water heater.

Open image on link above, and it shows your 240volt water heater wiring.
The 2 hot wires from breaker box connect to the red and black wires on top of heater.
Inside each water heater, the wires are color-coded and will appear the same, or nearly the same, as shown on link above.
As long as your wiring appears like the image, and the hot wires from breaker box connect correctly, and the circuit breaker is working fine, then your water heater will work.

Add a comment any time.

3) More electric water heater links about water heaters, thermostats and tank wiring:


1 Answer

WH40 water heater timer: Does black wire from service box go to terminal #1 and black wire to water heater to terminal #2? Does neutral (white) from service box go to terminal #3 and neutral (white) to...

WH40 is 240Volt timer.
WH40 will not work with 120V circuit.

See WH40 wiring illustration at following link:

There are two hot wires in 240V circuit because every circuit requires two wires to complete the circuit.
Hot wires from breaker connect to terminal 1 and 3.
Notice that small white wires are also connected to terminals 1 and 3.
Small white wires power clock motor located on back of mechanism, so this says power from breaker box must arrive on terminals 1 and 3. This insures that clock motor runs continuously.
If clock motor only runs when manual override switch is clicked ON, then your Hot and Load wires are reversed.

Bare ground wire connects to green ground screw.
Wires going to Load (water heater) connect to terminals 2 and 4.

FYI: Terminal A is not used unless circuit also has a Neutral wire,
See basic water heater circuit Diagram #2:

Terminal A is also used if you want to convert WH40 to 120V timer by replacing 240V clock with 120V clock.
How to convert Intermatic 240V timer to 120V timer

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1 Answer

Just water leakage under passenger side wheel well, only notice a puddle when rig gets shut-off and after using heater only, definetly water and no coolant. Could it be a dis-connected tube/pipe???

Sounds like condensation from the air conditioner evaporator. This is perfectly normal. Often the a/c will be run with the heater, especially when you use the defroster, as this dries the air and keeps the windshield from fogging up.

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