AERCO SmartPlate User Manual
Page 51
SmartPlate Installation, Operation & Maintenance Manual
CHAPTER 7 – TROUBLESHOOTING
OMM-0069_0E
AERCO International, Inc.
100 Oritani Dr. Blauvelt, NY 10913
Page 51 of 138
SP-100
Phone: 800-526-0288
PRI: 11/26/2013
Table 7-2. Troubleshooting – Electronic Control System (ECS/SP)
No.
Fault Indication
Probable Cause
Corrective Action
T1
System not operating.
All displays are blank.
1. External 120 VAC
power disconnected.
2. Defective fuse on
side of Control Box.
3. Defective ON/OFF
switch on Control
Box.
1. Ensure external circuit breaker is ON.
Check for 120 or 240 VAC power across
TB-2 terminal leads 101 (Line) and 102
(Neutral).
2. Check the fuse on the right side of the
Control box. Replace if blown.
3. Set ON/OFF POWER switch to the ON
(Up) position and verify that the switch
indicator lights. Also:
a. Verify that 120 VAC is present across TB-
2 terminal leads 101 (Line) and 102
(Neutral).
b. If voltage not present, replace ON/OFF
POWER switch.
T2
Temperature Controller is
ON, but Temperature
Indicators are blank
1. Circuit breaker
tripped
2. Defective 24 VAC
transformer in
Control Box
1. Reset the circuit breaker on the 24 VAC
step-down transformer.
2. Check the 120 VAC or 240 VAC power on
TB-2 (see Appendix B). Verify that 24
VAC is present across the Blue and
Brown wires terminated on TB-1. If 24
VAC is not present, replace the 24 VAC
transformer in the Control Box.
T3
Water Heater outlet temp.
consistently above
Setpoint by 10°F or more.
However, temperature is
below Over-Temp. limit
setting.
1. Temp. Controller is
not properly set.
2. Faulty Temp. Sensor
(thermocouple) is
connected to Temp.
Controller.
1. Refer to Chapter 4 – ADJUSTMENTS and
check current setting of Temp. Controller.
Readjust if necessary.
2. Verify Outlet Temp Sensor is securely
connected to cable plug. Replace the
Dual Sensor if necessary
T4
Over-Temp Alarm occurs
repeatedly.
NOTE
Audible alarms will be
generated if Outlet Temp
Sensor is open.
Erroneous temperature
readings will be displayed
if Sensor is shorted.
1. Over-Temp Switch
not properly set.
2. Open or shorted
Outlet Temp. Sensor
(thermocouple)
connected to Over-
Temp. Switch.
3. Over-Temp Switch is
defective.
1. Refer to Chapter 4 and check the current
setting of the ECS Over-Temp. Switch.
Readjust if necessary.
2. Check thermocouple connections
between Sensor connector plug and TB-1
terminal leads 111 (+) and 112 (-). If
connections are secure, replace Dual
Temp Sensor.
3. Replace Over-Temp Switch.
T5
Boiler Water Inlet audible
alarm activated
1. Boiler water temp. is
greater than 220°F.
2. Alarm setting is not
correct.
3. Indicator is defective.
1. Correct the boiler water temperature
supply to SmartPlate Heater.
2. Refer to para.4.3.2 to reset the alarm limit
to 220°F.
3. Refer to Chapter 8, para. 8.9 for
replacement instructions.