mFi MASON-LITE MFR16-48, Owner'S Operation And Installation Manual

Page: 20 / 26

20
TROUBLESHOOTING (Continued)
OBSERVED PROBLEM POSSIBLE CAUSE
REMEDY
Pilot lights but flame goes out when
control knob is released 1. Contol knob not fully pressed in
2. Control knob not pressed in long
enough
3. Equipment shutoff valve not fully
open
4.
Pilot flame not touching
thermocouple, which allows
thermocouple to cool, causing pilot
flame to go out. This problem could
be caused by one or both of the
following:
A) Low gas pressure
B) Dirty or partially clogged pilot
5. Thermocouple connection loose
at control valve
6. Thermocouple damaged
7. Control valve damaged
1. Press in control knob fully
2. After pilot lights, keep control
knob pressed in 30 seconds
3. Fully open equipment shutoff
valve
4. A) Contact local natural or
propane/LP gas company
B) Clean pilot (see
Cleaning
and Maintenance , page 14) or
replace pilot assembly
5. Hand tighten until snug, then
tighten 1/4 turn more
6. Replace thermocouple
7. Replace control valve
Burner does not light after pilot is lit 1. Inlet gas pressure is too low
2. Burner orifice clogged
3.
Thermocouple leads dis-
connected or improperly connected.
4. Burner orifice diameter is too
small
1. Contact local natural or pro-
pane/LP gas company
2. Clean burner (see
Cleaning
and Maintenance , page 14)
3. Reconnect leads
4. Replace burner orifice
Delayed ignition of burner 1. Pilot flame needs adjusting
2. Wrong pilot orifice 1. Adjust pilot flame for ap-
proximately 2" blue flame
2. Replace pilot orifice set
Burner flame is too low or too high 1. Incorrect gas supply or pressure
2. Blocked burner orifice or burner
manifold ports
3. Improper burner orifice size 1. Check for proper gas supply
pressure
2. Free burner orifice and
manifold ports of any burrs,
paint or other blockage
3. Verify proper burner orifice
sizing