ve hot water high limit control switch. In the event that the water temperature supercedes its preset operating degrees, the high limit control will turn the burner off until the water cools. Once your water returns to a safe operating temperature, it will automatically reset itself, if it doesn’t it is faulty and needs to be replaced. The thermostat is located on all machines on the outside of the coil housing on the exit or departureIn the pressure washing business it is very important to know how to repair equipment and to try to do as much of it yourself as possible. Let’s face it the most powerful forces of nature are the erosion of water, heat and pressure. Well that is exactly what goes through your equipment every time you turn it on. It may be necessary to remove he coil because of freeze breakage or to clean soot from it. This can be done easily, however, it can be a very messy job. Follow these steps:

You must disconnect the hose from the pump that leads to the inlet of the coil at the inlet side of the pump

Then disconnect electrical connection to the thermostat

Next remove the quick coupler from the discharge side of the coil and remove the burner assembly from the combustion chamber

Also remove all three 3/8 inch bolts from each side of the coil and tank assembly. (These bolts hold the tank to the chassis of the unit) *Earlier machine models have more bolts.

Disconnect 1/2 inch pipe nipples from the inlet and discharge sides of the coil. (Some earlier model machines have an elbow, usually also a 1/2 inch pipe)

Remove the top tank wrap exposing the coil and insulation. (Upright coil assemblies will be lifted in a skyward direction)

Remove the coil. (It will be heavy. You may need a cherry picker, come-along and chain with a big bolt). Be sure to replace torn or broken insulation

Put the coil on the lawn and blast it

To re-install the coil, reverse these steps. Be careful when repacking the insulation as it can catch on fire, been there done that, not fun to watch you equipment burn up.

High Limit Hot Water Thermostat

For reasons of safety, each unit is equipped with a surface sensitive hot water high limit control switch. In the event that the water temperature supercedes its preset operating degrees, the high limit control will turn the burner off until the water cools. Once your water returns to a safe operating temperature, it will automatically reset itself, if it doesn’t it is faulty and needs to be replaced. The thermostat is located on all machines on the outside of the coil housing on the exit or departure

can be a very messy job. Follow these steps:

You must disconnect the hose from the pump that leads to the inlet of the coil at the inlet side of the pump

Then disconnect electrical connection to the thermostat

Next remove the quick coupler from the discharge side of the coil and remove the burner assembly from the combustion chamber

Also remove all three 3/8 inch bolts from each side of the coil and tank assembly. (These bolts hold the tank to the chassis of the unit) *Earlier machine models have more bolts.

Disconnect 1/2 inch pipe nipples from the inlet and discharge sides of the coil. (Some earlier model machines have an elbow, usually also a 1/2 inch pipe)

Remove the top tank wrap exposing the coil and insulation. (Upright coil assemblies will be lifted in a skyward direction)

Remove the coil. (It will be heavy. You may need a cherry picker, come-along and chain with a big bolt). Be sure to replace torn or broken insulation

Put the coil on the lawn and blast it

To re-install the coil, reverse these steps. Be careful when repacking the insulation as it can catch on fire, been there done that, not fun to watch you equipment burn up.

High Limit Hot Water Thermostat

For reasons of safety, each unit is equipped with a surface sensitive hot water high limit control switch. In the event that the water temperature supercedes its preset operating degrees, the high limit control will turn the burner off until the water cools. Once your water returns to a safe operating temperature, it will automatically reset itself, if it doesn’t it is faulty and needs to be replaced. The thermostat is located on all machines on the outside of the coil housing on the exit or departure

. (These bolts hold the tank to the chassis of the unit) *Earlier machine models have more bolts.

Disconnect 1/2 inch pipe nipples from the inlet and discharge sides of the coil. (Some earlier model machines have an elbow, usually also a 1/2 inch pipe)

Remove the top tank wrap exposing the coil and insulation. (Upright coil assemblies will be lifted in a skyward direction)

Remove the coil. (It will be heavy. You may need a cherry picker, come-along and chain with a big bolt). Be sure to replace torn or broken insulation

Put the coil on the lawn and blast it

To re-install the coil, reverse these steps. Be careful when repacking the insulation as it can catch on fire, been there done that, not fun to watch you equipment burn up.

High Limit Hot Water Thermostat

For reasons of safety, each unit is equipped with a surface sensitive hot water high limit control switch. In the event that the water temperature supercedes its preset operating degrees, the high limit control will turn the burner off until the water cools. Once your water returns to a safe operating temperature, it will automatically reset itself, if it doesn’t it is faulty and needs to be replaced. The thermostat is located on all machines on the outside of the coil housing on the exit or departure

need a cherry picker, come-along and chain with a big bolt). Be sure to replace torn or broken insulation

Put the coil on the lawn and blast it

To re-install the coil, reverse these steps. Be careful when repacking the insulation as it can catch on fire, been there done that, not fun to watch you equipment burn up.

High Limit Hot Water Thermostat

For reasons of safety, each unit is equipped with a surface sensitive hot water high limit control switch. In the event that the water temperature supercedes its preset operating degrees, the high limit control will turn the burner off until the water cools. Once your water returns to a safe operating temperature, it will automatically reset itself, if it doesn’t it is faulty and needs to be replaced. The thermostat is located on all machines on the outside of the coil housing on the exit or departure

ve hot water high limit control switch. In the event that the water temperature supercedes its preset operating degrees, the high limit control will turn the burner off until the water cools. Once your water returns to a safe operating temperature, it will automatically reset itself, if it doesn’t it is faulty and needs to be replaced. The thermostat is located on all machines on the outside of the coil housing on the exit or departure side of the coils, thus measuring the water temperature as it is discharged from the unit to the pressure hose. If this thermostat unit fails, buy a new one. List price is between $35.00-$60.00 depending upon the manufacturer. Some are adjustable from 100? to 220? F. Those cost more. You need one set at a permanent 180? F, 185? F, 190? F or, 195? F. I personally like 190? F but you may chose what you like best.

Without heat you lose your cleaning power so you need to understand how these things work. Read this again as you stand next to your machine and think about each step.