Honeywell HM509 Parts Guide

6

7

8

9

TrueSTEAM

HM512, HM509, and HM506

TROUBLESHOOTING AND

PARTS REPLACEMENT GUIDE

69-2144-03

TROUBLESHOOTING

No. of

Red

Light

Blinks

Fault

Description

Steps to Fix

To be Performed by Professional

HVAC Technician Only

8–11

The backup

weld monitor

input is

active when

the backup

heater relay

is off.

• Replace the TrueSTEAM unit.

12

Temperature

of the elec-

tronic circuit

board is too

high.

• Ensure ventilation holes in the

cover are clear of obstruction,

and that 1 foot of clearance is

maintained around the cover’s

ventilation holes.

• Ensure the TrueSTEAM is

installed in a location with

conditioned air 32°F (0°C) to

104°F (40°C).

• Turn humidistat off and allow

time for electronic board to cool.

Unplugging unit and removing

cover will facilitate this.

• Turn humidistat on and press

RESET button.

• Confirm humidity call starts

(HUMIDIFYING light turns on).

• Allow unit to run and check for

steam leaks around tank and

ventilation holes.

• If steam is present, replace

TrueSTEAM.

13

Tank failed

to drain.

• Water in tank may be hot (>140ºF

[60ºC]) and can cause burns.

• Press and hold the EMPTY

button for 3 seconds.

• If unit fails to drain, turn

humidistat to OFF, or unplug the

humidifier and wait for water in

tank to cool. Ensure tank water

is cool before proceeding.

• Once cool, follow tank cleaning

steps in the Professional

Installation Guide (69-2036EFS).

• Reassemble tank and press the

RESET button.

• If fault persists, replace the

solenoid valve.

14

Heater failed

to boil water.

• Press and hold EMPTY button

for 3 seconds, and follow

tank cleaning steps in the

Professional Installation Guide.


RESET button.

• Initiate humidistat call.

• If fault returns, replace the unit.

TROUBLESHOOTING

No. of

Red

Light

Blinks

Fault

Description

Steps to Fix



3

Failure to

fill tank with

water.

• Ensure inlet water is on.

• Check for leaks around the tank

seal and solenoid valve.

• Turn off water supply and

replace in-line water filter.

• Press/hold RESET button until

the red Call Service light turns

off.

• If tank still fails to fill, press and

hold the EMPTY button for 3

seconds (if unit fails to drain,

unplug unit and make sure water

in tank is cool).

• Follow tank cleaning instructions

in the Professional Installation

Guide. Ensure you have a firm

grip of the tank prior to releasing

the tank, especially if water is

present.

• Clear any excess debris from

the tank’s bottom orifice to the

solenoid valve.

• Reassemble tank and plug unit

back in. Press the RESET button.

• If water still fails to flush into the

tank, replace the solenoid valve.

4

Heating

element

overheated.

• Press and hold the EMPTY

button for 3 seconds.

• Follow tank cleaning steps in the

Professional Installation Guide.


RESET button.

• If fault returns, replace with

applicable unit.

5

Input voltage

insufficient.

• Problem most likely due to

voltage variation from service

provider, or faulty wiring in

the home. If problem is due to

TrueSTEAM service alone, the

fault should correct itself when

voltage levels return to normal.

• Press and hold the RESET button

until CALL SERVICE light shuts off.

• Initiate a humidistat call for

humidity and monitor for fault

light to return.

• If fault returns, check the line

cord input voltage before and

during humidistat call. Line

voltage should not drop below

102Vrms to ensure TrueSTEAM

operates properly.

TROUBLESHOOTING

No. of

Red

Light

Blinks

Fault

Description

Steps to Fix



15

No Airflow.

• Unplug TrueSTEAM and remove

cover

• Validate proper wiring to

terminals R and C, using the

diagrams in the installation guide

(69-2036).

• Ensure proper connection quality

of the wires.

• Inspect R and C wires at the

HVAC equipment board, ensuring

no breaks and good connection

if wire nuts are used.

• Hook AC volt meter across

airflow switch normally-open

(N.O.) terminal and R.

• Set thermostat FAN to off and

reduce system setpoint.

• Validate 0 VAC reading on AC

Volt Meter

• Set thermostat FAN to on.

• Once blower starts, validate 20-

30VAC reading on AC volt meter.

• If voltage is not present, check

wiring and switch functionality.

Differential pressure switch may

require a new install location

(away from duct bends, etc), or it

may need to be replaced.

• If voltage is present, continue to

troubleshoot to validate proper

airflow monitoring.

• Keep AC volt meter across

airflow switch N.O. terminal and

R from HVAC unit.

• Turn humidistat off.

• Ensure DIP 4 and 5 are in off

(down) position.

• Secure TrueSTEAM cover and

plug in unit. Press the RESET

button.

• Set thermostat FAN to off and

reduce system set point.

• Set humidistat call and monitor

device. (may take 15-20 minutes)

• When sound of blower clears,

validate within 2 minutes that the

AC volt meter reads 20-30VAC.

• If time for switch to change state

takes longer than 2 minutes,

try a new install location for the

switch, where state change is

faster.

TROUBLESHOOTING

No. of

Red

Light

Blinks

Fault

Description

Steps to Fix



6

Water

overflow

sensed.

• Ensure drain hose is not kinked

or submerged in water at the

drain. Check functionality of

condensate pump if used.

• Check for water coming out of

drain/overflow line. If continuous

water flow is present, follow

the cleaning steps in the

Professional Installation Guide

(69-2036).

• After cleaning, set humidistat on

and monitor operation.

• If fault returns, unplug TrueSTEAM.

• Loosen cover screw and remove

cover.

• Disconnect water level sensor

wiring and lift snap-hinge

clamp to remove water sensor

assembly. See image on page 5.

• Clean probes using warm

soapy water so that the metal

is exposed. It is OK to use steel

wool or brush.

• Reassemble the sensor

assembly in the unit, reattach

and secure cover.

• Plug unit in, and press RESET

button.

• If fault reappears, replace water

sensor assembly and/or solenoid

valve.

7

HVAC power

not present.

• Turn humidistat off.

• At thermostat, validate that the

FAN setting turns the blower on.

If not, check the circuit breaker.

If circuit is tripped, reset or

replace fuse.

• If fault persists, unplug

TrueSTEAM and remove cover.

• Validate proper TrueSTEAM

wiring to R and C terminals, using

installation guide (69-2036).

• Ensure proper connection quality

of the wires.

• Inspect R and C wires at the

HVAC equipment board, ensuring

no breaks and good connection

if wire nuts are used.

• Hook AC volt meter across R and

C to validate 20-30VAC is present.

To measure, it may be necessary

to close furnace interlock switch.

• Secure TrueSTEAM cover and plug

unit in. Press the RESET button.

• If fault persists, recheck wiring or

replace unit.

Note:

If using VisionPRO IAQ to

control TrueSTEAM, it is not

necessary to monitor HVAC

power. DIP 4 may be turned on

to disable monitor.

Honeywell HM509 Parts Guide

Honeywell HM509 Manual

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