TEM P
Deg F
40
50
60
70
80
90
100
110
120
Res is tance (K)
26.11
19.90
15.31
11.88
9.30
7.33
5.83
4.66
3.76
TEM P
Deg F
130
140
150
160
170
180
190
200
210
Res is tance (K)
3.06
2.48
2.04
1.69
1.40
1.17
0.98
0.83
0.70
If all Okay, Replace Y-Series Boiler Contro l Bo ard
SENSOR RESISTA NCE A T VA RIOUS TEM PERA TURES
29
TROUBLESHOOTING GUIDE
In normal operating conditions, the Status Indications should be observed as follows:
Control Enabled
ON (lit)
Sensor Error
OFF
Setting Error
OFF
If the outdoor sensor fails and all other operating conditions remain the same, the control will remain on but it will
function as if the 70°F defeat mode is enabled. The following Status Indications should be observed:
Control Enabled
ON (lit)
Sensor Error
ON (lit)
Setting Error
OFF
If a different LED status is observed other than those described above, use the following detailed descriptions as a
guide:
If Control Enabled LED is OFF
Possible Causes:
1.
The output temperature sensor is out of range. The Sensor Error LED should be on. See below for details on the
Sensor Error LED.
2.
There is a setting error. The Setting Error LED should be on. See below for details on the Setting Error LED.
3.
The outdoor temperature is higher than or equal to the outdoor cutoff setting less the outdoor cutoff deadband
setting.
Sensor Error LED is ON or blinking ON/OFF once per second
Possible Causes:
LED ON steady: Outdoor (air) sensor is out of range.
LED blinking ON/OFF once per second: Output (water) sensor is out of range.
1.
Examine wiring, ensure continuity from Y-Series to sensor(s).
2.
Use a multimeter, measure resistance of sensor(s) compare with table below:
3.
If all okay, replace Y-Series Boiler Control Board.
Setting Error LED is ON
Possible Causes:
1.
The Maximum Output Temperature setting is less than the Minimum Output Temperature setting.
2.
The last stage selection is invalid. Either there is no stage selected or more than one stage is selected.
3.
The first output stage is not selected as a stage #1. The first output stage should be set as a stage #1 in all cases.
4.
In manual mode, the lead-lag selection is invalid (0 or 9).
5.
In manual mode, the lead-lag selection is higher than the last stage.
6.
In manual mode, the stage selected as the lead-lag is not set as a stage #1.
