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Hotsy 800 Series - User Manual

Hotsy 800 Series
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8.921-206.0-B 5/31/17
800 Series
Mobile - Hot Water - Oil-Fired
Operator’s Manual
Pressure Washer
MODELS:
821
1.109-120.0
842
1.109-121.0
843
1.109-122.0
844
1.109-123.0
845
1.109-124.0
851
1.109-125.0
873
1.109-131.0
874
1.109-132.0
852
1.109-126.0
853
1.109-127.0
854
1.109-128.0
855
1.109-129.0
856
1.109-130.0
For the Hotsy Dealer nearest you,
consult our web page at
www.hotsy.com
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8.932-965.0

Table of Contents

Questions and Answers

  • B
    Bryan BlanchardAug 19, 2025
    Why Hotsy 800 Pressure Washer will not run?
    • M
      miguelleeAug 19, 2025
      Your Hotsy Pressure Washer might not run due to several reasons: the pump switch may be in the OFF position (place it in the ON position), the power supply could be disconnected (connect the power supply), a fuse might be blown or a circuit breaker tripped in the electrical supply line (replace the fuse or reset the circuit breaker using only fuses of adequate capacity), or the motor circuit overload tripped (reset the pump switch).
  • S
    Suzanne EllisAug 21, 2025
    What to do if my Hotsy Pressure Washer runs but won't spray?
    • C
      Cheryl SummersAug 21, 2025
      If your Hotsy Pressure Washer runs but won't spray, try these solutions: Squeeze the trigger of the trigger gun, ensure the water supply is turned on by opening the water supply valve, and clean any clogs from the pressure nozzle opening.
  • A
    Anna JohnsonAug 23, 2025
    Why is there low spray pressure at the nozzle of my Hotsy 800?
    • A
      Anne MartinAug 23, 2025
      Low spray pressure at the nozzle of your Hotsy Pressure Washer can be caused by: inadequate water supply (fully open the faucet, check for kinked or damaged hose, use a 5/8 inch minimum hose, and check for debris clogging the inlet screen), a partially clogged or damaged pressure nozzle (clean or replace it), or air being drawn through the detergent inlet line (refill the detergent container and ensure the pick-up screen is fully immersed).
  • D
    donaldtaylorAug 26, 2025
    Why Hotsy Pressure Washer will not produce hot water?
    • S
      Sean HubbardAug 26, 2025
      If your Hotsy pressure washer isn't producing hot water, check the following: Ensure the burner switch is in the ON position. Refill the fuel tank with recommended fuels if the fuel supply is inadequate. Make sure the pump switch is turned on, as the pump must be running before the burner will light. Verify adequate water supply by fully opening the faucet, checking for kinks or damage to the hose, using a 5/8 inch minimum hose, and checking for debris clogging the inlet screen. Squeeze the trigger of the trigger gun, as water must be spraying for the burner to light.
  • D
    Daniel WhiteAug 27, 2025
    What causes poor or no detergent flow in my Hotsy Pressure Washer?
    • G
      Gabriela EverettAug 27, 2025
      Poor or no detergent flow in your Hotsy Pressure Washer can result from: inadequate detergent supply (refill the detergent container, ensure the pick-up screen is fully immersed and open the metering valve), a clogged detergent screen or hose (clean it, always start with a clean detergent container), or a clogged detergent valve (clean it).
  • S
    Steven MillerAug 29, 2025
    How to fix uneven spray pattern on a Hotsy Pressure Washer?
    • M
      Marc SellersAug 30, 2025
      An uneven spray pattern on your Hotsy Pressure Washer is likely due to a partially clogged or damaged nozzle. Clean or replace the nozzle to resolve this issue.
  • K
    Kirsten CisnerosAug 31, 2025
    What causes poor cleaning performance with my Hotsy 800 Pressure Washer?
    • T
      Thomas LoganSep 1, 2025
      Poor cleaning performance with your Hotsy Pressure Washer can be attributed to: improper detergent concentration or mixing (mix detergent per manufacturer's instructions, ensuring powdered detergents are fully dissolved), using the wrong detergent for the application (select the appropriate detergent), or rinsing with hot water (a final rinse with cold water will reduce water spotting).
  • S
    Scott RobertsSep 3, 2025
    Why Hotsy Pressure Washer pressure will not run?
    • M
      Megan WheelerSep 3, 2025
      Your Hotsy Pressure Washer might not run due to several reasons: * The pump switch could be in the OFF position. If so, place the switch in the ON position. * The power supply might be disconnected. Ensure you connect the power supply. * A fuse might be blown or a circuit breaker tripped in the electrical supply line. Replace the fuse or reset the circuit breaker, using only fuses of adequate capacity. * The motor circuit overload might have tripped. In this case, reset the pump switch.
  • L
    lindawilliamsSep 5, 2025
    What to do if Hotsy Pressure Washer pressure runs but won't spray?
    • N
      Nicholas WestSep 5, 2025
      If your Hotsy Pressure Washer runs but doesn't spray, check these: * Ensure the trigger of the trigger gun is squeezed. * Verify the water supply is turned on by opening the water supply valve. * Inspect the pressure nozzle for clogs and clean the pressure nozzle opening if necessary.
  • J
    Jessica WalkerSep 9, 2025
    What to do if Hotsy 800 Pressure Washer machine smokes while burner unit is running or unit smokes at cold-start only when burner is off continued?
    • K
      Kathryn AlexanderSep 9, 2025
      If your Hotsy pressure washer continues to smoke, check these: * If the engine RPM is low, increase the RPM to the correct specifications, as indicated on the serial plate. * If the fuel pressure is too high for a clean burn (fuel PSI above 140 and below 200) and it smokes when the burner is off, reduce the fuel pressure PSI and increase the air band set for a cleaner burn without maximum water heat loss.

Summary

Safety

Introduction & Safety Information

General introduction to safety and owner responsibilities.

Important Safety Information

Details critical warnings for safe operation and injury prevention.

Protection from Freezing

Advises on preventing freeze damage to the machine.

Asphyxiation Risk

Warns about ventilation requirements to prevent asphyxiation.

Electrical Safety

Guidelines for safe electrical connections and grounding.

Operations

Technical Specification

Provides detailed specifications for different machine models.

Component Identification

Illustrates and names key parts of the pressure washer.

Assembly Instructions

Guides users through unpacking and assembling the machine.

Installation Instructions

Covers venting, electrode, and burner air adjustments.

Operations Instructions

Details the steps for starting and operating the pressure washer.

Detergents & General Washing Techniques

Explains detergent use and effective cleaning methods.

Shut Down And Clean Up

Provides procedures for turning off and cleaning the machine.

Maintenance

Pump

Covers proper care, oil changes, and winterization for the pump.

Pump Motor

Details on oiling the pump motor and bearing lubrication.

Relief Valve

Notes that the relief valve is factory set and not adjustable.

Burner Fuel Filter

Guidance on draining water and cleaning or replacing the filter element.

Heating Coil

Information on de-scaling and de-sooting the heating coil.

Brake

Recommends inspecting brake components every 50 hours.

Troubleshooting

Pressure Not Running

Addresses issues like power supply or switch problems.

Low Spray Pressure

Covers causes like clogged nozzles or inadequate water supply.

Uneven Spray Pattern

Deals with issues related to nozzle or air intake.

Not Producing Hot Water

Troubleshoots problems with the burner or fuel supply.

Poor or No Detergent Flow

Addresses issues with detergent supply or clogs.

Machine Smokes

Diagnoses smoke issues from burner or soot accumulation.

Poor Cleaning

Offers solutions for ineffective cleaning results.

Hotsy 800 Series Specifications

General IconGeneral
BrandHotsy
Model800 Series
CategoryPressure Washer
LanguageEnglish

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