Not enough info. Car heater? House heater? Gas? electric? Water?
Manufacturer Contrl Auxiliary Emission Controls. You have a problem with the factory emission controls.
There is a problem with your airbag system. Some vehicles will blink to display a diagnostic trouble code. For example 10 flashes, pause and 3 flashes, will indicate the trouble code 13.
The heater hoses on a 305 engine run from the intake manifold to the heater core and the heater core to the radiator. This creates a constant source of heat to supply the heater.
You can call customer service at 1-866-456-8934. They can send spare parts, trouble shoot over the phone, etc. This is the parts servicer for Lowes. The company name is Sunrise.
Low coolant and a clogged heater core are possibilities.
Call a swimming pool tech to trouble shoot then show you how everything works.
With a test light.
To trouble shoot a device the problem with the device has to be stated. With a UPS the first thing to check is the batteries.
Sure, that way is not a problem. The other way around OTOH would be trouble.
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Short the windings and perform resistance testing. Check your rectifier for shorted and/or opened diodes (likely open).
There are signs that there is a problem with a hot water heater. When you cannot get your water to heat. It could be signs that the pipes leading to the heater are leaking. It could be a problem with the thermostat in the heater.
An air compressor is a complicated machine , in order to trouble shoot any problems , there must be a detailed description of the problem/s.
It is just an aid to help trouble shoot the problem. Older TVs didn't tell you what might be wrong.
trouble shoot it
If this is a portable Hot Tub - spa - Jacuzzi, you as a homeowner, should not attempt trouble shooting the components under the spa skirt. You are not qualified nor do you have the proper testing devices. Most likely your electronic heater has failed. You need to call a qualified service tech to do this job -- your life can depend on someone who is knowledgeable of codes and swimming pool equipment. k
Trouble code P0059 means: HO2S Heater Resistance (Bank 2, Sensor 1) The problem is in a heated oxygen sensor