Cumberland C80M - Common Operational Faults

12. Troubleshooting Guide
PNEG-308 Purafire 41
Possible Cause Corrective Action
1. Unit does not operate (no LED indication).
1. No power to heater. 1. Check and repair electrical supply.
2. Thermostat open or malfunction. 2. Reset or replace thermostat.
3. Toggle switch open or malfunction. 3. Turn toggle switch to the “ON” position or replace.
4. 24 Volt transformer. 4. Check 24 volt power output of transformer across terminals
#3 and #4 of terminal block. If no output voltage is detected,
replace the transformer.
5. Flame safeguard relay module (FSR). 5. Check 24 volt power input to terminal #9 on FSR. If power
is not detected, replace the red wire going to terminal #4 of
the TB1. If power is detected at terminal #9 on FSR, replace
the FSR module.
2. Motor does not run (with LED indication).
1. Air proving switch closed (one (1) flash). 1. See symptom #6 of the Troubleshooting Guide.
2. Air providing switch does not close (two (2) flashes). 2. See symptom #7 of the Troubleshooting Guide.
3. Motor tripped on overload protector (two (2) flashes). 3. See symptom #4 of the Troubleshooting Guide.
4. Motor malfunction (two (2) flashes). 4. Replace motor.
5. Burner fails to light (three (3) flashes). 5. See symptom #9 and #10 of the Troubleshooting Guide.
6. Flame safeguard relay module (FSR) malfunction
(four (4) flashes).
6. See symptom #13 of the Troubleshooting Guide or
replace the FSR module.
3. Motor does not start, but hums or runs slowly (two (2) flashes).
1. Blower wheel binding. 1. Remove obstruction, realign and secure the blower
wheel or replace damaged blower wheel.
2. Motor binding. 2. Replace the motor.
3. Capacitor inoperative. 3. Replace the capacitor.
4. Motor trips on thermal overload (two (2) flashes).
1. Low voltage. 1. Check power input with heater running at terminals #1 and
#2 of TB1. Voltage should be that specified on the
nameplate. If not correct values, check power source to
determine if wiring to heater has excessive voltage drop.
2. Low gas flow. 2. See symptom #13 of the Troubleshooting Guide.
3. High motor Amps (with burner operating). 3. Replace motor.
4. Weak motor capacitor. 4. Replace capacitor.
5. Motor starts, then stops.
1. Air proving switch contacts do not close
(two (2) flashes).
1. See symptom #7 of the Troubleshooting Guide.
2. Burner does not light and/or does not stay lit
(three (3) flashes).
2. See symptom #9 and #10 of the Troubleshooting Guide.
3. Motor trips on thermal protector (two (2) flashes). 3. See symptom #4 of the Troubleshooting Guide.