The air switch to the alarm could be bad that’s a 20 dollar part. It could be that something is wrong with the effluent pump as well. If you have two lights on the system one amber and one red the amber is for the aerator and the red is for the pump in 99 percent of cases. . The airline to the tank or in the tank could be separated as well if you open the aeration tank and can’t hear air bubbles then the line is broke or separated somewhere and needs to be fixed and the smell will go away in couple days. Did someone put chemicals down the drain paint thinner, gallon of bleach, pine o pine, mop water etc. that would kill the bacteria and make it smell as well. Just because the scew is not broke doesn’t mean the diaphragms are working they could be tore behind the black plastic piece and you can’t see it happens a lot.

You can but it's advised you use the full rebuild kit. The little check valves on the chamber blocks go bad and that's why you should just a full Hiblow rebuild kit.

If red dust is inside the unit then it means the coils are going out. The pumps run non stop for years and after awhile the components start to age. As the coils get weak they cant product enough charge to push the magnet properly, also by being weakened it cant keep the magnet at a proper distance from the coil itself. when this happens iron oxide is formed from the reaction of the electrical charge and the iron in the magnet this is what creates the red dust. We will not rebuild units like this they tend to fail rather fast so its best to just replace it with a new septic air pump.

You have probably rebuilt it for the last time depending on how old the hiblow is. If approaching the 9-11 year mark it’s probably best to replace it next time. Red dust inside the unit is a sign the coils are getting weak and the unit needs to be replaced. It’s the gust is caused by the magnet getting to close to the coils cause iron oxide to form. If it’s been a shorter period you might have underlying issues like a diffuser needs to be replaced. To purchase a new one, this is the cheapest online seller we have been able to find for a hiblow hp-80.

We recommend replacing the internal components of your septic aerator once every 2 years. This ensures that you wont need to buy an entire new pump, and will help keep operational costs to a minimum over the lifetime of your septic system.