Emilie Meyer
If you have a leaking coil pan in your Goodman furnace, there are several possible causes and solutions. One common cause is a clogged drain line, which can be cleared by flushing or cleaning the drain. If the drain is clear, the pan itself may be cracked, in which case it can be sealed with silicone or replaced entirely. Other solutions include using fiberglass resin materials or spray rubber seal to repair the pan, or adjusting the pitch of the coil and furnace to ensure proper drainage.
How to seal a leaking coil pan in a Goodman furnace
| Characteristics | Values |
|---|---|
| Cause of leak | Drain outlet is backed up, drain pan is cracked, or furnace is back-sloped |
| Solutions | Clean the drain outlet, seal the crack with silicone, or adjust the slope of the furnace |
| Materials | Silicone, fiberglass resin, spray rubber seal, pipe nipple, soap, teflon tape, J-B Weld |
| Tools | N/A |
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What You'll Learn
Check if the drain is clogged
If your Goodman HVAC is leaking water from the inside unit, it is likely that the drain outlet is backed up. To check if the drain is clogged, look for a 3/4-inch PVC tube coming out of the coil. This is usually glued in place, so you may need to cut it. Then, use a tool to insert into the drain and carefully clean or flush it. You can also try to loosen any blockages by sticking your finger or something with a curve into the drain pipe.
If you are unable to access the drain pipe, you may need to remove the coil door or the front doors of the air handler to gain access to the coil drain line. Once you have access, carefully clean or flush the drain line. If the drain is clear, the issue may be a hole in the drain pan, which you can seal with silicone or replace the pan entirely.
It is also possible that the drain line is clogged due to a restriction in the water flow caused by dirty internal piping or a secondary heat exchanger. To check for this, ensure that the entire drain line is clean, including inside the furnace. Some furnaces also have a built-in trap that can become plugged, so make sure to check and clean the trap if necessary.
If your Goodman AC unit is leaking water, it is likely due to a clogged drain pipe. You can try using an empty water bottle to squeeze air into the pipe to unclog it, or use a shop vac to clear the blockage.
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Seal the hole in the drain pan with silicone
If your Goodman HVAC is leaking water from inside the unit, there could be a blockage in the drain outlet. To fix this, locate the 3/4-inch PVC tube coming out of the coil and carefully clean or flush the drain. If the drain is clear, there may be a hole in the drain pan, which can be sealed with silicone or by replacing the pan.
- Purchase a 100% silicone sealant product, such as Loctite 100% Silicone, to ensure it is fully waterproof.
- Gather your materials: sealant, caulking gun, utility knife, clean cloths, water or mineral spirits, and gloves.
- Remove the drain pan from the unit.
- Locate the hole in the drain pan and clean the area around it with a cloth. Ensure it is dry.
- Using the caulking gun, apply the silicone to the underside of the top part of the drain pan, covering the hole. Apply the sealant evenly and precisely, exerting steady pressure.
- Reinsert the drain pan into the unit and press it firmly into place.
- Remove any excess silicone with a cloth and water or mineral spirits.
- Allow the silicone to dry completely before using the unit. Refer to the product instructions for drying and curing times.
Note: Some sources suggest using silicone to seal the seam between the furnace and coil of a Goodman furnace to prevent air leaks. It is recommended to run a bead of silicone before setting the furnace on the coil.
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Use fiberglass resin materials to repair the pan
If your Goodman furnace is leaking water from inside the unit, it could be that the drain outlet is backed up. The first step is to locate the drain, which is usually a 3/4-inch PVC tube coming out of the coil. If it is glued, you may need to cut it and clean or flush the drain. If the drain is clear, you may have a hole in the drain pan, which can be sealed with silicone, or you may need to replace the pan.
To repair the pan, you can use fiberglass resin materials, similar to those used to repair leaks on motorcycles. This is a more complex process and requires you to first pull out the evaporator coil and support it. Then, remove the pan and apply the fiberglass resin to the damaged areas, following the instructions on the product you have chosen.
Goodman HVAC systems rely on clean evaporator coils to operate efficiently. Regular maintenance of these coils is crucial for optimal performance, efficient cooling, and energy savings. A clean evaporator coil ensures that the HVAC system doesn't have to work as hard to cool the air, which can lead to potential energy savings on utility bills. Signs that your Goodman evaporator coil drain pan needs replacing include visible rust or corrosion, water leaks, and mould or mildew growth.
If you are sealing the seam between the furnace and the coil, you can use silicone. It is recommended to run a bead of silicone before setting the furnace on the coil.
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Use spray rubber seal to repair the pan
If you have a leaking coil pan in a Goodman furnace, you can use spray rubber seal to repair the pan. This is a good option if the damage to the pan is not too severe.
First, you will need to locate the source of the leak. Check the drain outlet, which is a 3/4 inch PVC tube coming out of the coil. If it is glued in place, you may need to cut it. Carefully stick something into the drain to clean or flush it, then get a coupling from a hardware store to glue it back together. You may also be able to clean the coil drain line by removing the coil door or the front doors of the air handler to access the inside.
If the drain is clear, you may have a hole in the drain pan. Inspect the pan for holes and, if found, seal them with spray rubber. Before applying the spray rubber, ensure that the pan is clean.
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Replace the drain pan
If your Goodman furnace is leaking water from inside the unit, it could be due to a clogged drain outlet. Look for a 3/4-inch PVC tube coming out of the coil. This is the drain. If it is glued, you may need to cut it. Clean or flush the drain carefully. If the drain is clear, there may be a hole in the drain pan. You can try to seal it with silicone, or you may need to replace the pan.
- Cut the straps holding the refrigerant lines and remove the cover.
- Carefully slide the coil out of the cabinet. You may need to suspend it from the attic or ceiling, or support it with something.
- Once the coil is out, carefully remove the old drain pan.
- Install the new drain pan, ensuring it is secure and level.
- Cut the 3/4" PVC drains and reconnect them using a coupling.
- Blow out your primary drain line to ensure it is not clogged.
It is important to note that replacing the drain pan can be a complex task, and it may be advisable to consult a professional for assistance. Additionally, there have been recalls of Goodman evaporator coil drain pans due to fire hazards, so it is important to check if your model is affected.
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