ECR International A Series Installation, Operation And Maintenance Manual page 25

!
WARNING
Electrical shock hazard. Only a trained, experienced
service technician should perform troubleshooting
procedure. Failure to do so could result in death or
serious injury.
Table C-3 - System and General Troubleshooting
Problem
Furnace will not start.
Furnace will not start
without first pushing oil
primary control reset
button.
(Happens on frequent
basis)
APPENDIX C - SEQUENCE OF OPERATION AND TROUBLESHOOTING
Possible Cause
Thermostat not calling for heat
No power to furnace
Thermostat faulty
Oil primary control faulty
Photo Cell wiring shorted or
room light leaking into photo
cell compartment
Open safety switch
No fuel oil
Clogged nozzle
Clogged oil filter
Low oil pump pressure
Air getting into fuel oil lines, or
fuel oil line dirty, clogged, or in
some manner defective
Defective burner motor
Check thermostat and adjust.
Check thermostat for accuracy; if mercury switch type, it might be off level.
Check furnace switch, main electrical panel furnace fuse or circuit breaker.
Look for any other hand operated switch, such as old poorly located furnace
switch, which was not removed during furnace replacement.
Remove thermostat wires from oil primary control terminals T-T. Place a
jumper across T-T. If furnace starts, replace thermostat, thermostat sub-base
(if equipped), or both.
Check reset button on oil primary control.
Remove thermostat wires from oil primary control terminals T - T.
Check for 24V across T -T. If no voltage is present, check for 115V to oil
primary control.
If 115V is present, refer to oil primary control documentation provided with
oil burner.
Check photo cell (cad cell) wiring for short circuits.
Check for room light leaking into cad cell compartment. Repair light leak if
necessary.
Check for open limit or auxiliary limit.
Check internal wiring connections; loose connectors, etc.
Check fuel oil supply.
Check all hand operated fuel oil valves are in open position. Fill oil storage
tank if necessary.
Replace nozzle with high quality replacement.
Use rating plate or Tables in Appendix A as a guide.
Replace oil tank filter or in-line filter if used.
Connect pressure gauge to oil pump.
Adjust pump pressure, or replace oil pump if necessary.
Verify erratic pressure readings are not caused by defective fuel oil line.
Check fuel oil lines.
Replace any compression fittings found with high quality flared fittings.
Check for signs of oil leaks. Any oil leak is potential source of air or
contaminants.
Check burner motor.
If burner motor is cutting out on over-load, determine why. Replace if
necessary.
25
Remedy
PN 240010964 Rev. L [10/01/2021]