Trinity
│
Installation and Operation Instructions
Ti Series
46
13.0 TROUBLE SHOOTING
This section is intended to assist the service technician in detecting and correcting common errors. The Sentry 2100 is equipped
with an internal diagnostic system that verifies control operation. The following series of error codes has been developed to aid in
diagnosing control problems:
Problem
Detected Problem
Solution
ER1
On Display
“Water Temperature
Excessive”
Sentry has sensed a water
temperature in excess of
250ºF at the water
temperature thermister.
1.
If the boiler is extremely hot check for adequate water pressure and
circulation, contact NTI for assistance.
2.
If not hot, check for sources of grounding or shorting (i.e. water) at the
thermister electrical connections, check wiring from Sensor to Sentry
Control.
3.
Replace thermister if the resistance is not in the correct range. (See
resistance charts for 1 M-Ohm Trinity Thermister)
ER2
On Display
“Water Temperature
Thermister Short Circuit”
Sentry has sensed a short
circuit in the water
temperature thermister circuit.
See ER1.
ER3
On Display
“Water Sensor Open
Circuit”
Sentry has sensed an open
circuit in the Water Sensor
circuit.
1.
Check wiring to Water Sensor for open circuits or shorting to ground
(i.e. water). (Note: ER3 will be displayed if temperature sensed is less
then 0
F.)
2.
Replace Water Sensor if the resistance is not in the correct range. (See
resistance charts for 1 M- Ohm Trinity Thermister)
ER4
On Display
“24V Limit Error”
Sentry has sensed a lack of
24V on the outlet of the
Sentry burner relay (B1).
The error locks the boiler out for one hour before retrying ignition.
1.
Reset power, if error goes away the problem is intermittent and was
likely caused by a tripped limit that has automatically reset, check for
adequate water pressure and flow rate. Allow the boiler to cycle and
verify proper operation including outlet water temperature and flue
temperature. If operation is unsuccessful and the error reoccurs continue
to step 2.
2.
Ti100-200’s are equipped with a low water pressure switch on the boiler
return that requires a minimum of 10PSI to complete the 24VAC
ignition circuit. Ensure there is a minimum of 15PSI on the boiler outlet
prior to the primary circulator; ensure the boiler is plumbed in primary-
secondary fashion. Replace water pressure switch if plumbing and
pressure is correct and if it measures an open circuit.
3.
Check for continuity through the 24VAC limit wiring and manifold and
stack limits, replace limits or wiring that are not a closed circuit.
ER5
On Display
“DHW Time-Out”
The ER5 option is ON and the
Sentry has sensed that the
DHW call has lasted longer
then 2.5 hours, thus removing
priority from the DHW call.
Reset the ER5 error by resetting the power or cycling the DHW call. Check
for proper operation of the DHW call.
1.
Combi’s are equipped with a DHW flow switch; ensure it is not sticking
in the closed position when there is no DHW flow. If so, remove it and
free it of any debris and check for proper operation, replace if necessary.
2.
For non-Combi boilers, operating with an indirect water heater, check
for proper boiler water circulation during a DHW call, and check for
proper operation of the indirect water heater’s Aqua-stat.
3.
For applications with prolonged DHW draws, turn the ER5 option OFF.
ER6
“Flame Lock Out”
Sentry has sensed a lack of
24V to the gas valve during
operation or a Fenwal ignition
lockout.
There is a problem in the ignition sequence, it could be caused by a faulty
igniter, flame sensor, gas valve or improper line pressure or combustion.
Check ignition sequence to determine which component is not functioning.
(Sentry will retry ignition sequence 1 hour after ER6 code originally occurs
or if control is reset)
If a 3-Flash error occurs on the Fenwal controller prior to locking out on an
Er6, proceed to “Three Flashes on Fenwal”.
Burner shuts
off before
set-point
temperature
is reached
(and burner
light goes out)
Reset calculation being used
to lower HI setting.
If OD probe is being used, the HI setting will be calculated using formula in
Section 12.0, adjust RES setting as necessary.
Thermostat is satisfied
1.
If the thermostat demand light is turning off, the thermostat has satisfied.
2.
If DHW temp light is turning off; the Aqua-stat or call for DHW has
been satisfied.
