HTP PH100-55 - Page 49

49
926 CONTROL BOARD ERROR CODES
CODE DESCRIPTION DURATION CORRECTIVE ACTION
E131
Combustion
Fan Speed
Low. The
heater
combustion
air fan speed
less than 70%
of expected.
60 Sec.
1. Check the combustion air fan wiring.
2. Replace the combustion air fan.
3. Replace the control board.
E14
Combustion
Fan Speed
High. The
heater
combustion
air fan speed
is more than
130% of
expected.
60 Sec.
1. Check the combustion air fan wiring.
2. Replace the combustion air fan.
3. Replace the control board.
LEO
Water Level in
Tank is Low
Until
Corrected
1. Be sure all air is bled from system.
2. Inspect low level switch and wiring for
damage and repair if necessary.
FLU
Blocked Vent
Pressure
Switch open,
Condensate
cup Full,
Condensate
Cup not
present
Until
Corrected
1. Check the flue vent to be sure it is not
blocked or damaged.
2. Check the blocked vent pressure
switch operation by applying a jumper.
(If the switch is not functioning properly,
replace it.
LOU 24 Volt Low
Until
Corrected
1. Check line voltage. Must be between
100 – 128 volts.
2. If available, connect a PC and, using
HTP service software, check the 24v
supply display in the lower left corner of
the screen. The number displayed here
must be greater than 128 and should be
greater than 250. Use this as a
troubleshooting guide as you follow the
steps below.
3. Remove 10 pin Molex connector from
customer connection board. If LOU
clears, then the problem is with external
sensor wiring. Examine external sensor
wiring for shorts to ground, repairing as
necessary. If LOU code is still present
and the boiler is so equipped, disconnect
high gas pressure switch, then low gas
pressure switch, then UL 353 low water
cutoff in this order, one at a time, to see if
LOU code clears. Replace faulty part.
Check low voltage wire harness in heater
for shorts to ground.
4. If LOU only occurs when burner tries to
light, check gas valve for excessive
current draw.
5. If LOU is present with the low voltage
harness disconnected from the 926
control board, replace the 926 control
board.
RESISTANCE TABLE FOR
SUPPLY TEMPERATURE
SENSOR
HIGH/LOW
TEMP. SENSOR
TEMP. (
o
F)
RESISTANCE
(ohms)
32 32550
41 25340
50 19870
59 15700
68 12490
77 10000
86 8059
95 6535
104 5330
113 4372
122 3605
131 2989
140 2490
149 2084
158 1753
167 1481
176 1256
185 1070
194 915
202 786
212 667
Table 11
Table 12