Question about Mr. Heater MH170FAVT Open Flame Gas Utility
Heater lights properly, but flame shuts off after about 5 minutes, no matter what thermostat setting. The fan continues to run, but the flame won't relight automatically when temperature drops below thermostat setting. Heater won't stay lit when thermostat is set at max temp. setting. Running off of 1000 gal LP tank with commercial regulator installed by gas supplier.
Roger, you either have a gas supply issue or a voltage problem.
Since I don't know your aptitude and abilities pertaining to LP gas troubleshooting/testing procedures, I don't know how detailed you want to go...basically, make sure your propane tank isn't empty; or that the pressure regulator didn't freeze up. Make sure that it is rated and set for 28" of water column output.
Check to make sure all the wire connections are secure to the flame control terminal block and to each of the hi-limit switches.
Isolate & perform continuity checks to each electrical component, including the gas valve.
You'll need a manometer to test and set the gas input & output water column levels.
When the unit is running,, what color is the flame?
Is there a roaring sound?
Is the flame small and weak?
Posted on Dec 25, 2013
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Posted on Jan 02, 2017
I had to replace the regulator. If you have a propane appliance shop near you, you can probably just get the nipple that goes into the bottle. It's aboit 3/16" diameter, 3/4" long and may have a 6 sided end up inside the screw on cap of the regulator.
Posted on Feb 24, 2009
it sound like the blower motor may be seizing up. try spining the blade by hand to see if it feels free or not. the motor could be trying to turn but can then tripping itself out on overload. (most motors have built in safety overloads which will trip during an overcurrant event. aka too many amps.) you may have to replace blower motor
Posted on Mar 22, 2009
How large and sealed of an area are you using it in? I ask because those units have a low oxygen sensor which will shut it down if there is not enough oxygen in the space.(kinda prevents that pesky suffocation thing). Otherwise if using it in larger cold spaces, the issue is can be from the smaller tanks. As mentioned above, a larger tank can solve this, because these units have a fairly good input rate, which will cause the smaller tanks to freeze, and lower the propane temperature and evaporation rate, basically runs out of gas until the tank warms back up.
Posted on Sep 26, 2009
SOURCE: heater shuts off
The heater thermostat senor for this heater could be bad or indicating a abnormal temperture shutting it down. You might want to return item if still under warranted
Posted on Nov 06, 2009
SOURCE: heater turns on and heats
Problem: Your furnace will not ignite the gas to
produce heat for your home. When a furnace has a bad ignitor what I see most of
the time is the following sequence of operation:
1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution:You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor.If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.
Posted on Dec 11, 2010
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