Table 4. Trouble Shooting Chart

Below in chart form are various symptoms of a malfunctioning system, possible defects that will cause these symp- toms and suggested corrective measures. The chart assumes that the proper gas pressure is available to the heater and that the lighting procedure is as stated on the plate attached to the heater.

SYMPTOMS

CAUSES

SOLUTIONS

 

 

 

burner light off very slow

partially block pilot orifice

replace

 

pilot out of adjustment

re-adjust pilot

 

 

 

burner light off very slow infra-red

partially blocked burner orifice

replace

color stays dull

 

 

 

 

 

burner flash back

low gas pressure

call your gas supplier

(roaring noise during operation

 

and ceramic grid surface will be

dark)

damaged burner

replace

 

 

 

ceramic grid or burner sooting up

first check for damaged burner

replace if damaged

(when new or after cleaning)

orifice

 

 

if burner orifice is not damaged

replace

 

then check for damaged manifold

 

 

 

 

pilot cannot be ignited

blocked pilot orifice

replace

 

gas cock not in position

gas cock knob must be

 

 

turned to pilot and held

 

 

depressed

 

pilot gas flow adjustment

open and adjust

 

screw may be closed

(see Figure 12)

 

 

 

pilot lights but goes out

defective thermocouple

replace

 

defective control

replace

 

 

 

pilot stays lit but main burner

loose wire or improperly wired

tighten connections, check

will not light

 

wiring diagram

 

defective control

replace

 

blocked burner orifice

clean orifice or replace

 

 

 

failure to ignite

main gas off

open manual valves

 

air in gas line

bleed gas line

 

loose wire connections

tighten wire connections

 

dirty wire connections

clean terminals and secure

 

 

terminals

 

 

 

3. REPLACING THE GAS VALVE UNIT

A.Remove the two gas valve unit wires at the gas control valve labeled “PP”.

B.Unscrew gas valve from gas piping.

C.Reconnect gas valve and unit wires to terminals “PP”. Be sure to leave thermostat wire on one terminal.

4.FREQUENCY OF OPERATOR CHECKS

Intermittent use. Appliances that are used seasonally should be checked before shutdown and again before the next use.

Dusty, wet or corrosive environment. Since these environments can cause the gas control to deteriorate more rapidly, the system should be checked more often.

The gas control should be replaced if:

A.It does not perform properly on checkout or trouble shooting.

B.The gas control knob Is hard to turn or push down, or it fails to pop back up when released.

Model # MH25NG/LP

HS25NG/LP

E13 Installation instructions and Owner’s Manual

Page 12 Page 14
Page 13
Image 13
Mr. Heater HS25NG/LP, MH25NG/LP Symptoms Causes Solutions, Replacing the GAS Valve Unit, Frequency of Operator Checks
Page 12 Page 14

HS25NG/LP, MH25NG/LP specifications

The Mr. Heater HS25NG/LP and MH25NG/LP are reliable and efficient heating solutions designed for both residential and commercial spaces. These powerful units deliver warmth and comfort, making them ideal for garages, workshops, and outdoor settings.

One of the standout features of the HS25NG and MH25NG is their versatility in fuel options. The HS25NG is designed to use natural gas, while the MH25NG operates on propane, providing flexibility based on user needs and availability. This adaptability allows users to select the most convenient and cost-effective energy source for their heating requirements.

Both models are equipped with a robust heat output, with the capability to deliver 25,000 BTUs per hour. This level of performance ensures quick heating even in larger spaces, establishing a comfortable environment in minimal time. The units also feature a wide heating area that can efficiently cover spaces up to 600 square feet, making them suited for various applications.

User safety and efficiency are paramount in the design of these heaters. The HS25NG and MH25NG come with an automatic shutoff system that activates if the unit tips over or detects any obstruction to airflow. Additionally, they are equipped with a built-in piezo ignition system, enabling easy and reliable lighting without the need for matches or an external ignition source.

The heaters also incorporate advanced technology to optimize performance. Their infrared heating design allows for direct and efficient warmth, minimizing energy loss and ensuring that heat is directed where it's needed most. This not only enhances efficiency but can also lead to reduced energy costs over time.

Both models are designed with portability in mind, featuring a lightweight construction and convenient carry handle, making it simple to move the unit from one location to another as needed. The durable construction ensures that they can withstand the rigors of frequent use, whether it be in a workshop or an outdoor gathering.

In summary, the Mr. Heater HS25NG/LP and MH25NG/LP are powerful, versatile, and reliable heating solutions that combine advanced technology with user-friendly features. With their strong heat output, safety features, and option for both natural gas and propane, these heaters are an excellent choice for those looking for efficient heating in any environment.
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