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Problem
Using natural gas and
pilot will not light.
Pressure Switch
When using natural gas (NG), there is a
pressure switch that acts to turn off the gas
flow to the pilot if the inlet pressure exceeds
9.5" WC. This is to prevent the operation of
the unit on the wrong gas (propane/LP). If
your natural gas supply exceeds 9.5" WC the
unit will not operate. Either contact your gas
supplier to check and adjust the inlet pressure
or a qualified service technician can bypass
the pressure switch.
Before attempting to bypass the pressure
switch, make sure the type of gas being used
is correct. Check to make sure the connection
fitting is in the correct inlet on the regulator.
Refer to Connecting to Gas Supply, page 13.
Only a qualified installer should bypass the
pressure switch. To bypass the pressure
switch locate the set screw on the regulator.
Use a small flat bladed screw driver to turn the
set screw counterclockwise 2 turns. This will
bypass the pressure switch function.
Problem
When ignitor button is
pressed in, there is no
spark at ODS/pilot
200233-01B
TROUBLESHOOTING
Possible Cause
I n l e t p r e s s u r e e x c e e d s
9.5" WC.
Possible Cause
1. Ignitor electrode is posi-
tioned wrong. Ignitor elec-
trode is broken.
2. Ignitor electrode is not con-
nected to ignitor cable.
3. Ignitor cable is pinched or
wet.
4 Broken ignitor cable.
5. Bad piezo ignitor.
www.usaprocom.com
Corrective Action
Bypass pressure switch. See
instructions below.
The entire gas delivery piping including con-
nections inside the heater should be leak
tested by the qualified installer. After leak
testing the qualified installer should light the
appliance. Refer to the correct flame pattern
as illustrated on page 23. All flame patterns
should be safely inside the product. If for any
reason they are not, stop use of the appliance
and call for repairs.
Pressure Switch
Set Screw
Figure 27 - Gas Regulator Pressure
Switch
Corrective Action
1. Replace electrode.
2. Replace ignitor cable
3. Free ignitor cable if pinched
by any metal or tubing. Keep
ignitor cable dry.
4. Replace ignitor cable.
5. Replace piezo ignitor.
21
- Quick Links:
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- Installation
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- Troubleshooting
- Replacement Parts
- Parts
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Table of Contents
Need help?
Do you have a question about the MNSD300HGA and is the answer not in the manual?
Questions and answers
I cant get the pilot light to light I followed the instructions correctly ??
To troubleshoot the pilot light issue on a Procom MNSD300HGA:
1. Check Gas Supply – Ensure the equipment shutoff valve is fully open.
2. Follow Lighting Instructions – Turn the control knob to OFF, wait five minutes, then try lighting the pilot again by pressing the ignitor button.
3. Manual Lighting – If the ignitor does not work, light the pilot with a match following the Manual Lighting Procedure (page 18).
4. Hold Control Knob – After lighting, keep the control knob pressed for 30 seconds.
5. Check Gas Pressure – If the pilot does not stay lit, gas pressure may be too low. Contact your gas supplier.
6. Consult Troubleshooting Guide – Refer to pages 20-24 for additional troubleshooting steps.
7. Seek Professional Help – If the issue persists, contact a qualified service technician or gas supplier for repairs.
This answer is automatically generated