TROUBLESHOOTING GUIDE
Possible Cause Possible Remedy
2a. Gas valve in off 2a. Turn to on position.
off position.
2b. System in lock-out 2b. Reset system.
mode.
2c. Cracked or broken 2c. Replace sensor.
sensor ceramic.
2d. Defective or loose 2d. Correct or replace.
connections to flame
sensor or flame
sensor lead.
2e. Incorrect gas 2e. Check and adjust if necessary to
pressure. manufacturer’s recommendations
and replace if necessary.
2f. Insufficient current 2f. Check current according to
signal from flame manufacturer’s recommendations
sensor. and replace if necessary.
2g. Incorrect or loose 2g. Check wiring.
wiring.
2h. Poor ground to 2h. Check grounding means.
ignition control.
2i. No power to ignition 2i. Check voltage to controller and gas
controller or gas valve.
valve.
2j. Loose limit control 2j. Check connections.
connections or Replace limit control if necessary.
defective unit.
2k. Defective or plugged 2k. Inspect gas valve regulator.
gas valve regulator. Replace if necessary.
2l. Defective thermostat 2l. Calibrate thermostat or replace if
or thermostat out necessary.
of calibration.
2m. Thermostat heat 2m. Check anticipator setting and correct
anticipator if necessary.
incorrectly set.
2n. Defective ignition 2n. Replace.
controller.
Possible Cause Possible Remedy
3a. Flame sensing 3a. Check flame sensing rod, sensor
circuit failure. ceramic, sensor lead and
connections for damage or loss of
continuity. Replace defective
elements.
3b. Soot on sensing rod. 3b. Clean off soot and adjust pilot to
smaller size.
3c. Blockage in heat 3c. Clean heat exchanger.
exchanger. Determine cause and correct.
3d. Blockage in main 3d. Clean or replace orifice.
burner orifice.
Possible Cause Possible Remedy
4a. Faulty thermostat 4a. Check thermostat and anticipator
or improper heat setting. Replace if defective.
anticipator setting.
4b. Defective ignition 4b. Replace.
controller.
4c. Defective gas control. 4c. Replace.
27
2. Pilot lights, main burner will not light.
3. Burner shuts down before thermostat is satisfied.
4. Burner fails to shut off after thermostat is satisfied.
For Service . . .
If a qualified service person cannot solve the problem, consult
your local gas company or local Modine representative.
W
hen servicing, repairing or replacing parts on these units
always give the complete Model Number (which includes power
code/control code) and Serial Number from the unit rating plate.
RATING PLATE IDENTIFICATION
When servicing, repairing or replacing parts on these units
always give the complete Model Number, Power Code Number,
Control Code Number and Serial Number from the unit rating
plate.The sample below shows what these numbers mean.
P - Propeller Unit
B - Blower Unit
S - Separated
Combustion
H - High Efficiency
F - Unit equipped with
intermittent pilot ignition
V - Unit equipped with
intermittent pilot ignition
and concentric vent
compatible.
MBH Input
150 - 150,000 Btu/hr input
170 - 170,000 Btu/hr input
225 - 225,000 Btu/hr input
etc.
H
eat Exchanger Type
A - Aluminized
S - Stainless Steel
Control Code Type
30 - 115v/25v intermittent
pilot ignition, 100%
Shut-Off with continuous
retry, natural gas
31 - 230v/25v intermittent
pilot ignition, 100%
Shut-Off with continuous
retry, natural gas
etc.
Power Code
01 - 115v/60Hz/1φ
02 - 230v/60Hz/1φ
etc.
P
S H 28 0 A V 01 3 0
MODEL NUMBER DESIGNATIONS
Motor Vendor Code
01 - Century
05 - Universal
etc.
F
an or Blower
Vendor Code
01 -Revcor
08 -Brookside
etc.
Series Identity Number
Identifies which series of controls
were furnished on the unit.
Sequence
Number
Year of Manufacture
96 - 1996
97 - 1997
etc.
W
eek of Manufacture
01 - 1
st
week of year
26 - 26
th
week of year
etc.
0
1 01 201 01 97 1000
SERIAL NUMBER DESIGNATIONS
RATING PLATE
Power Code Control Code
SERIAL NUMBER MODEL NUMBER
01122010195 PSH280AF 01 30
Heater Parts from ACF Greenhouses
