
LP-517 Rev. 000 Rel. 019 Date 7.21.20
55
LINE VOLTAGE E19
PUMP OFF
E19 indicates the line voltage frequency
is out of range. This could happen if the
boiler is being powered from a small
gasoline powered generator that is
overloaded or not functioning correctly.
Inspect power wiring to the boiler and repair as necessary. If
connected to line voltage, notify the power company. If connected
to an alternate power source such as a generator or inverter, make
sure the line voltage frequency supplied by the device is 47 - 62.5 Hz.
BURNERTEMPBLOCK E28
PUMP ON TIME
This error indicates the burner sensor
has exceeded 199
o
F. The burner will re-
fire once the burner temperature drops
below 181
o
F. If this occurs more than
five times in ten minutes during a single
heat demand, an F28 lockout code is
generated.
1. Check sensor by turning off the gas and allowing the unit to go
through pre-purge and post purge cycles. While air is flowing through
the burner check the burner sensor value on the display. This value
should similar to the current intake air temperature. If this value is
much different than the current intake air, check sensor resistance
and wiring. If resistance values are out of range replace sensor.
2. If sensor is ok, check combustion, often a rich combustion setting
elevates burner temperatures. Ensure there are no blockages on
either the intake or the exhaust. Confirm the combustion is set
to proper CO2 numbers, especially on low fire. After adjusting
combustion, re-start the boiler and observe the burner temperature
on the display. This should be done both on high and low fire.
Table 27 - Boiler Error and Fault Codes
Outdoor Sensor
(7250P-319)
Supply Temperature
Sensor
(7250P-324)
Indirect Sensor
(7350P-325)
Boiler
Sensor
(7700P-
073)
Flue
Temperature
Sensor
(6300P-023)
Burner
Temperature
Sensor
(6300P-036)
Temperature (
o
F)
Resistance
(ohms)
Temperature (
o
F)
Resistance (ohms)
-22
171800
32
32624
-13
129800
41
25381
-4
98930
50
19897
5
76020
59
15711
14
58880
68
12493
23
45950
77
10000
32
36130
86
8056
41
28600
95
6530
50
22800
104
5324
59
18300
113
4365
68
14770
122
3599
77
12000
131
2982
86
9804
140
2483
95
8054
149
2079
104
6652
158
1748
113
5522
167
1476
176
1252
185
1066
194
912
203
782
212
674
Table 28 - Sensor Temperature Resistance