SmartPlate EV Installation, Operation and Maintenance Manual
CHAPTER 7
– TROUBLESHOOTING
OMM-0147_C
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TABLE 7-2. Troubleshooting
– Electronic Control System (ECS II)
No.
Fault Indication
Probable Cause
Corrective Action
T6
Outlet water temp. far
below Setpoint
1. Incorrect Temperature
Controller setting
2. Defective Temp.
Controller.
3. Heat exchanger
fouled on DHW side.
4. Defective Control
Valve Actuator
5. Boiler water supply
temp. is too low.
6. Boiler Failure
1. Refer to Chapter 4 and check the current
setting of Over-Temp switch. Readjust if
necessary.
2. Remove the cover from the Electronics
Module of the Control Valve and verify that
the Temp. Controller is generating a
control signal greater than 0 VDC. If not
replace Temp. Controller.
3. Clean Domestic Hot Water Inlet Strainer.
Clean heat exchanger.
4. Replace Valve Actuator (see Table 7.1)
5. Increase boiler water temperature.
6. Check operational status of Boiler.
T7
Wide fluctuations in outlet
water temperature during
large flow changes.
1. Boiler water
temperature drops
below DHW setpoint
but does not recover
until load is reduced.
2. Boiler water supply
temperature is too
high.
3. Boiler water
temperature drops
below DHW setpoint
during heavy demand,
then recovers.
1. The boiler water supply is under-sized.
Add more boilers or reduce DHW usage.
2. If boiler water temperature is greater than
the maximum design boiler water
temperature, reduce boiler water
temperature to maximum design boiler
water temperature.
3. Install Boiler Water Buffer Tank before
SmartPlate EV boiler water inlet to provide
hot water reservoir for the Water Heater to
draw from during large load swings.
T8
Temperature control not
within specifications.
Items T1
– T7 check out
OK.
Wide fluctuations in outlet
water temperature under
low flow conditions.
1. Unexpected system
dynamics.
2. Outlet Temp Sensor
connected to Temp
Controller gives
inconsistent or
intermittent readings.
3. Flow Meter is open,
shorted or gives
inconsistent readings.
1. See Table 7-3 for Temperature Control
Troubleshooting.
2. Replace Outlet Temp Dual Sensor at the
Water Heater outlet port.
3. Replace Flow Meter.
