Element
Operation and Maintenance
L-OMM-0003_A
• 10/8/2021 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
127
of
157
MESSAGE
DESCRIPTION
LED Flashes
MODBUS CODE
LOW HSI
The PIM control board is not sensing the correct amp draw
from the HSI (Hot Surface Igniter). This is most likely
caused by a faulty or disconnected igniter.
4
LOW 24VAC
The 24VAC supply to the PIM control is below threshold for
reliable control operation. May be caused by low voltage to
the water heater or a faulty 120/24VAC supply transformer.
5
17
VENT MAX
The vent temperature sensor is used to protect low
temperature vent systems from damage caused by high
flue gas temperatures. When this alarm occurs, first
confirm that the vent material is suitable for the application
as well as the limit setting for this control. When this
product is operated with high return or inlet water
temperature, the flue gas can exceed the rating of low
temperature vent systems.
6
18
HTR MAX
Water temperature has exceeded safety limit. May be
caused by a sensor failure or a faulty control board.
7
11
HTR TOP
Indicates problem with top temperature sensor, possibly a
shorted wire or failed sensor.
NOTE
: The top sensor and
the high limit sensor are located in the same probe body.
8
14
HI LIMIT
Indicates problem with high limit temp sensor, possibly a
shorted wire or failed sensor.
NOTE
: The top sensor and
the high limit sensor are located in the same probe body.
8
14
HTR BOT
Indicates a problem with the bottom temperature sensor,
possibly a broken or shorted sensor wire or failed sensor.
8
VENT
Indicates a problem with the vent temperature sensor,
possibly a broken or shorted sensor wire or failed sensor.
8
LOGASPRES
FAIL
The low gas pressure safety switch (optional) is not
sensing minimum gas pressure required for safe operation.
Check the gas pressure to ensure that the minimum is
available. If the gas pressure is adequate check for
fluctuating gas pressure or a faulty pressure switch.
9
REM PROV
FAIL
The remote proving circuit is designed to check for the
operation of ancillary mechanical room equipment such as
a fresh air damper or flow switch. Check for the proper
function and correct wiring of such equipment.
10
LOW WATER
FAIL
The low water cutoff is not sensing water at its probe. May
be caused by a faulty low water board or sensor
12
HTR LOST
Possible bad connection between the PIM control and the
digital control display, or failure of either device.
14
HIGASPRES
Check gas pressure to ensure that building supply does
not exceed value on the water heater rating plate. If within
rated limit, check for faulty pressure switch.
15
16.1.3 Fuse
The 24 VAC input and output circuits of the PIM are protected by an 8.0 Amp fuse.
