Mr. Heater MH80KTR - User Manual

Mr. Heater MH80KTR

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MH50KR, MH80KTR,

MH140KTR, MH185KTR,

MH210KTR

WARNING: If the information in this manual is not followed exactly, a fire or

explosion may result causing property damage, personal injury or loss of life.

— Donotstoreorusegasolineorotherflammablevaporsandliquidsinthevicinityofthisorany

otherappliance.

— Servicemustbeperformedbyaqualifiedserviceagency.

Thisisanunventedportableheater.Itusesair(oxygen)fromtheareainwhichitisused.Adequate

combustionandventilationairmustbeprovided.Refertopage3.

KEROSENE FORCED-AIR HEATER

OPERATINGINSTRUCTIONSANDOWNER’SMANUAL

READ INSTRUCTIONS CAREFULLY:Readandfollowallinstructions.Placeinstructionsinasafe

placeforfuturereference.Donotallowanyonewhohasnotreadtheseinstructionstoassemble,

light,adjustoroperatetheheater.

Model#

www.mrheater.com • 800-251-0001

NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!

Questions and Answers

A
Anthony RuizAug 16, 2025
Why is my Mr. Heater MH80KTR Heater not sparking?
- O
  ohallAug 16, 2025
  If your Mr. Heater heater isn't sparking, start by checking the extension cord's length and gauge to ensure it meets the proper amperage requirements. Next, verify the wiring to the igniter matches the wiring schematic in the manual. Inspect the gap between the electrode probes, ensuring it's between 2.3 and 3 mm. If there's still no spark, replace the igniter assembly. If the issue persists, consider replacing the oil flame control assembly.
J
James MorrisAug 20, 2025
Why is my Mr. Heater MH80KTR unable to detect flame?
- C
  Cassandra NavarroAug 20, 2025
  If your Mr. Heater heater is unable to detect a flame, check the wiring to the cad cell, referring to the wiring schematic in the manual. Clean the cad cell photocell. If the heater still doesn't operate, replace the cad cell. If the problem persists, replace the oil flame control assembly.
Z
zparkerAug 27, 2025
How to fix CAD Cell Failure in Mr. Heater MH80KTR Heater?
- A
  amy78Aug 28, 2025
  To address a CAD Cell Failure in your Mr. Heater heater: * First, check the wiring to the CAD cell, referring to the wiring schematic in the manual. * Then, try cleaning the CAD cell photocell. * If the heater still doesn't work, replace the CAD cell. * As a last resort, replace the oil flame control assembly.
S
Susan WoodardAug 31, 2025
What to do if Mr. Heater MH80KTR Heater experiences high limit switch failure?
- J
  jenniferfranklinAug 31, 2025
  If your Mr. Heater heater's high limit switch fails, let the heater cool off, then press the reset switch and try again.
S
Sally AguirreSep 4, 2025
How to reset Mr. Heater Heater with an open high limit switch?
- K
  kennethcampbellSep 4, 2025
  To address an open circuit in the high limit switch of your Mr. Heater heater, ensure the heater is cooled off, switch it to the “OFF” position, wait five minutes, and then try again.
B
Brooke AllenSep 7, 2025
What to do for a Mr. Heater MH80KTR Heater flame control failure?
- A
  Alicia SheltonSep 8, 2025
  To address a flame control failure in your Mr. Heater heater, first check the wiring within the heater, referring to the wiring schematic in the manual. If the issue persists, replace the oil flame control assembly.
J
jonathon70Nov 11, 2025
How to fix a Mr. Heater Heater when no flame is detected?
- S
  sarahandersonNov 11, 2025
  If your Mr. Heater heater isn't producing a flame, several factors could be at play. First, ensure the wiring to the motor aligns with the wiring schematic in the manual. Next, verify that the pressure gauge is correctly positioned and undamaged. Adjust the pressure to ensure it's optimal for the heater's operation, as detailed in the manual. With the heater unplugged, manually rotate the fan clockwise to confirm the motor isn't stuck. Inspect the pump rotor for any signs of damage, replacing it if necessary. If these steps don't resolve the issue, and the wiring is correct but the motor still won't rotate freely, consider replacing the motor or power-pack assembly. As a last resort, try replacing the oil flame control assembly. Also, check for spark arching from the electrode assembly to ...
N
Nicholas WilliamsNov 22, 2025
What to do if my Mr. Heater MH80KTR Heater sparks but has slow motor operation?
- A
  anthonymaloneNov 22, 2025
  If your Mr. Heater heater sparks and calls for a flame but the motor operates slowly or not at all, begin by checking the motor's wiring against the schematic in the manual. Ensure the pressure gauge is properly in place and undamaged. Adjust the pressure for proper heater operation as per the manual. With the heater disconnected from the power source, try rotating the fan clockwise to ensure the motor isn't seized. Inspect the pump rotor for damage and replace it if needed. If the wiring is correct, the pump rotor is in good condition, and the motor still doesn't rotate freely, replace the motor or power-pack assembly. If the problem continues, replace the oil flame control assembly. Also, check for spark arching from the electrode assembly to the combustion cylinder, and verify the cad c...

Mr. Heater MH80KTR Specifications

General

Model	MH80KTR
BTU Output	80, 000 BTU
Heating Area	2, 000 sq. ft.
Fuel Type	Kerosene
Ignition	Piezoelectric
Type	Forced air heater

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