10
Troubleshoot
No Display or LED Lights
Check the power to the HWE-SS. The HWE-SS requires 120VAC power to the Black wires or
24VAC to the right most terminals. Turn the power off and back on to restore the display. If
unsuccessful, make sure the Display Cover of the control is securely mounted to the Base.
System or Outdoor Reads OPEN or SHORT
If Open, short the sensor input terminals. The display should read SHORT. If it doesn’t, the
HWE-SS may be damaged.
If Short, remove the wires from the input terminals. The display should read OPEN. If it
doesn’t, the HWE-SS may be damaged.
System or Outdoor Reads an Incorrect Temperature
Remove the wires from the input terminals. The display should change to read OPEN. If
it doesn’t, the HWE-SS may be damaged. Take an ohm reading across the detached sensor
wires. The ohm reading should correspond to the Temperature Sensor Chart. If the difference
is within 5°F adjust the Trim for the sensor Otherwise, the sensor may be damaged.
No Heat - All LEDs are OFF
Check the outdoor temperature and Outdoor Cutoff readings. If the outdoor temperature is
above the Outdoor Cutoff, the HWE-SS will not give heat. If the display shows
TSTAT
OPEN
then, check the EXT terminals. If the EXT terminals are not jumped together, the
HWE-SS will not give heat.
No Heat - All LEDs are ON
Remove any connections to the Yellow wires for the Heating System Pump. Test for
continuity across the pair of Yellow wires. If the wires are continuous, the HWE-SS is calling
for the Heating System Pump to run and the problem is not with the HWE-SS. Check the
power source and the pump to determine why it is not circulating.
No Heat - System Pump LED ON
Check that the displayed System water temperature is below the Target water temperature
minus the Differential. If not, wait until the System temperature falls, and then the stage
LED should come on and the boiler should fire
. Otherwise, remove all connections from the
Blue pair of wires for boiler control. Check for continuity across the pair of Blue wires. If
the wires are continuous, the HWE-SS is calling for the boiler to run. Check the boiler to
determine why it is not firing.
No Heat - Boiler LED ON
The HWE-SS is registering a call for DHW. If the DHW Priority is set to a value other
than NO, the Heating System Pump will not run during the priority period of a DHW call.
Generally the DHW will be satisfied before a drop in ambient temperature is noticeable. If the
DHW load is large or the boiler can satisfy both loads, change the Priority setting to NO, this
will allow the Heating System Pump to circulate heating water while the DHW tank is being
satisfied.
Cold DHW - Boiler LED ON
Check if the System water temperature display is approximately 200°F or above Max. Target.
If it is cooler, remove any connections across the Blue pair of boiler wires. If the Blue
wires are continuous, then the HWE-SS is calling for the boiler to run. Check the boiler to
determine why it is not firing. If the System Water temperature is hot, remove any connections
to the pair of White wires for the DHW pump. Check for continuity across the pair of White
wires. If the wires are continuous, the HWE-SS is calling for the DHW pump to circulate.
Check the pump to determine why it is not circulating.
Temperature Sensor Chart
TEMPERATURE
(in Degrees
°
F)
Value
(in Ohms)
-30
117720
-20
82823
-10
59076
0
42683
10
31215
20
23089
25
19939
30
17264
35
14985
40
13040
45
11374
50
9944
55
8714
60
7653
70
5941
80
4649
90
3667
100
2914
110
2332
120
1879
130
1524
140
1243
150
1021
160
842
170
699
180
583
190
489
200
412
210
349
220
297
230
253
240
217
250
187
