AERCO Electronic Controls System (ECS) - Manual (Page 46)

Electronic Control System (ECS) and Type CXT-E Valve
7. TROUBLESHOOTING
Page 46 of 82
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288 VD2: 02/28/14
OMM-0003_0D AC-105
Table 7-2. Troubleshooting – Electronic Control System (ECS)- Continued
NO.
FAULT
INDICATION
PROBABLE CAUSE CORRECTIVE ACTION
T13
Wide
fluctuations
in outlet
water
temperature
under low
flow
conditions.
1. Outlet Temp Sensor
connected to Temp
Controller is intermittent
2. Obstruction in Flow
Sensor.
3. Inlet Orifice worn or not
properly seated.
4. Recirculation Pump
failure.
1. Replace Outlet Temp Dual Sensor
at Heater outlet port.
2. Clean or refurbish Flow Sensor per
Section 6.
3. Replace Orifice or reseat in required
nozzle position.
4. Replace Recirculation Pump.
T14
Temp
Controller
displays
Loop break
(Lbr) error
message
1. Outlet Temp Sensor not
connected.
2. Outlet Temp Sensor
defective.
1. Ensure Temp Sensor connector
plug is securely connected.
2. Replace Outlet Temp Dual Sensor
installed at Heater outlet port.
T15
Outlet water
temperature
above Over-
Temp Limit,
but Solenoid
(Dump)
Valve does
not open.
1. Disconnected or
defective Solenoid
2. Defective Over-Temp
Switch
1. Verify that 24 VDC is present at
Solenoid plug between leads
103(+) and 104 (-).
If voltage is present and Solenoid is
connected, it is defective and must
be replaced. If 24 VDC is not
present, go to item 2.
2. Replace Over-Temp Switch.
T16
Inconsistent
temperature
reading
1. Sensor wire polarity
reversed.
2. Faulty Sensor.
1. Check polarity of TC wiring; J
Thermocouple Standard Wiring:
-- Red wire is negative.
-- White wire is positive.
(Refer to Wiring Diagram B-2)
2. Replace TC Sensor.
OPEn
Secondary
Input is
missing.
g
1. Flow meter not powered.
2. Failed feedforward sensor.
3. Unplugged connection to
feedforward sensor.
1. Check power LED of Flow meter. Apply
power or replace.
2. Replace feedforward sensor.
3. Ensure proper sensor connections.