on my 2003 GMC 2500 there is a control module inside the heater duct work on the passenger side. It is easy to access and replace with a couple of screws. Replaced mine and fixed the problem.
Could be the heater core.
heater vent will not readjust to any position
The best venting options for a tankless water heater are direct venting and power venting. Direct venting uses a sealed pipe system to vent exhaust gases outside, while power venting uses a fan to push exhaust gases outside. Both options are efficient and safe for tankless water heaters.
Tankless water heater venting kits typically include components such as vent pipes, elbows, termination caps, wall thimbles, and necessary hardware for installation. These components are essential for safely venting the exhaust gases produced by the water heater to the outside of the building.
Safety considerations for water heater venting include ensuring proper installation and maintenance of the venting system to prevent carbon monoxide buildup, checking for obstructions or blockages in the vent pipe, and ensuring that the vent pipe is the correct size and material for the water heater. It is also important to have a carbon monoxide detector installed near the water heater to alert you to any potential leaks. Regular inspections and maintenance by a qualified professional are essential to ensure safe operation of the water heater venting system.
Gas tankless water heaters require proper venting to safely remove combustion gases from the unit. Venting requirements typically include using a dedicated vent pipe that is properly sized and installed according to the manufacturer's guidelines. It is important to ensure that the venting system is designed to prevent backdrafting and allows for proper airflow to maintain efficient and safe operation of the water heater.
It does not have a heater control valve.It does not have a heater control valve.
Installing a tankless water heater with direct venting in your home can provide benefits such as energy efficiency, cost savings on utility bills, continuous hot water supply, space-saving design, and reduced risk of carbon monoxide exposure.
To vent a water heater properly, you need to ensure that the vent pipe is the correct size and material, slopes upward away from the water heater, and terminates outside the building. It is important to follow the manufacturer's guidelines and local building codes to ensure safe and efficient venting. Regular maintenance and inspection of the venting system are also recommended to prevent any issues.
Where is the the heater control valve??
No. Gas water heaters are not all designed to use direct venting.
The heater control valve is used to shut off hot coolant from entering the core when the heater is in the off position. A heater control valve can be actuated by either a vacuum line or a cable from the vacuum heater control valve to the heater core. This hose should be warm; if not the heater control valve is stuck and needs to be replaced