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28
Troubleshooting
Diagnostics
There are some diagnostic routines programmed into the PC board. If these routines detect a problem the unit
will shut down and flash the “ERROR” LED a certain number of times, followed by a long pause.
Table 28-1
Power
Steam Generator
Error
Service
Life
LED
#5
Definition
S
Unit operational and is filling, draining or has no call for demand.
S
Unit is operating and the gas is on.
S
B
S
High humidity/sail switch is open, will not operate until closed.
S
B
Unit has run for over 90% of bed life, will operate until 100%.
S
S
Unit has accumulated 100% of bed life, will not operate until reset.
S
1B
Fill timeout to low level during initial fall.
S
2B
Water level drop below low level during basic operation.
S
3B
Fill timeout from low to high level.
S
4B
Water level above high level timeout.
S
5B
Illegal switch state.
S
6B / 7B / 8B
Ignition burner #1 error / ignition burner #2 error / ignition burner #3 error.
S
9B
Low level not dropped below during empty drain.
S
10B / 11B / 12B
Blower/burner #1 error / blower/burner #2 error / blower/burner #3 error.
S
13B
Safety low probe open.
14B
Pressure switch error.
15B
E
2
Error Corrupted Software
16B
Aqua Stat Error
Power dropped out.*
S - Solid On
B - Blinking On (Flashing)
1 Blink -
The low level switch did not close in set fill
time.
Check -
Defective fill valve, debris in fill valve inlet
screen or line to level container, water
leakage from tank or tubing, low or no water
pressure, drain valve stuck open or leaking,
defective low water level switch (electrodes
need cleaning).
2 Blinks -
The low level switch has not closed in 3
minutes of fill cycle time.
Check -
Debris in fill valve, no water flow or low water
pressure, drain valve leaking or stuck open,
defective low water switch (electrodes need
cleaning).
3 Blinks -
The high level switch did not close by
completion of initial fill.
Check -
Defective fill valve, debris in fill valve inlet
screen or line to level container, water
leakage from tank or tubing, low or no water
pressure, drain valve stuck open or leaking,
defective low water level switch (electrodes
need cleaning).
4 Blinks -
The high water switch is still closed 5
minutes after hitting high level.
Check -
Fill valve stuck open, defective high level
switch, debris in level container.
5 Blinks -
The high level switch is closed and the low
level switch is open.
Check -
Defective level switch(es), loose wire to level
switches, scale on electrodes.
6 Blinks / 7 Blinks / 8 Blinks -
Ignition burner #1
error / Ignition burner #2 error / Ignition
burner #3 error
Check -
Gas may be turned off to the unit, defective
igniter, loose wire from ignition module
to igniter or flame sensing rod. (Only
applies to units with software GFH150.HEX,
GFH300.HEX, GFH450.HEX)
9 Blinks -
The low level switch has not opened after a
set drain.
Check -
Defective low level switch, defective drain
valve, debris in level container tubing or
drain valve.
10 Blink / 11 Blink / 12 Blink -
The blower/burner
#1/#2/#3 is not operating.
Check -
No power to blower, loose wire to blower, or
loss of tach signal.
13 Blinks -
The safety low probe is open.
Check -
Defective low water level switch,
electrodes need cleaning, loose wire to
probe, debris in level container.
14 Blinks -
The exhaust pressure switch is open.
Check -
Blocked exhaust flue, loose wire to
pressure switch
15 Blinks -
E
2
Error - corrupted software data.
Check -
Reset unit, regenerate power. Reset E
2
16 Blinks -
Aquastat error, stuck open.
Check -
For loose or disconnected wire to
aquastat setting is too high.
*Power loss to unit due to stack over
temperature situation -
The over temperature
module cuts out.
Check -
For low water situation, level control
electrodes for scale buildup, loose or
disconnected wire from probe to module.
