Warranty

whl-648 Rev. 001 Rel. 000 Date 4.11.19
56
C. Suggested Corrective Actions
Problem Possible Causes Possible Remedies
No electrical power to the
boiler
1. Is the plug on the power supply cord unplugged
from the electrical outlet?
2. Is electrical panel’s 10 Amp circuit breaker
tripped?
3. Is the fuse on the circuit board good?
4. Is there a power outage to the home?
1. Reset the plug.
2. Reset the circuit breaker.
3. If the display panel is blank, unplug the unit or
contact a qualied service technician.
4. Contact the power company.
No water available when faucet
is opened
1. Is the water supply valve shut o at the meter (do
cold water faucets work)?
2. Is the water supply valve near the unit open?
3. Is the water pipe frozen?
4. Is an error code ashing on the display panel
(leak detected)?
1. Open the closed supply valve.
2. Open the water supply valve.
3. Turn OFF the unit, close all water valves and the
gas valve. Contact a qualied service technician.
4. Refer to error code information and contact an
qualied service technician.
Hot water is not available when
the faucet is opened
1. Does the boiler have power (plugged in)?
2. Is the boiler turned ON?
3. Is an error code ashing on the display panel?
4. Is the gas supply valve open or shut o at the
meter (do other gas devices work)?
1. Restore electrical power to the unit.
2. Press and hold the Power button to turn the unit
ON.
3. Refer to the Diagnostic and Error Codes section
in this manual.
4. Open the gas supply valve.
The water temperature is
not hot enough or turns cold
during use
1. Is the faucet open enough to draw at least 0.6
gallons (2.3L) per minute through the boiler?
2. Is an error code ashing on the display panel?
3. Is the outlet water temperature set too low?
1. Open the faucet to allow more water ow.
2. Refer to the Diagnostic and Error Codes section
in this manual.
3. Adjust the outlet water temperature (refer to the
procedure in this manual).
It takes a long time before hot
water ows from the faucet
Is the faucet some distance from the boiler?
1. Allow time for the cold water already in the pipes
to ow from the faucet.
2. Have recirculation valves and/or plumbing
return line(s) installed and program the unit for
recirculation mode.
Domestic hot water is too hot
or not hot enough
Is the water temperature set too high or low? Adjust the temperature setting
House is not heating up Is the CH temperature set too low? Adjust the temperature setting.
A fan can be heard even when
the unit is not operating
1. The fan continues to operate after the burner
shuts o to clear the exhaust vent of combustion
gases.
2. The fan may run to help prevent freezing.
1. This is normal operation – no action is required.
2. Protect the boiler from freezing temperatures or
shut o and drain the unit.
White “smoke” can be seen
coming out of the exterior
exhaust gas vent
Depending on the outside temperature, water
vapor can be produced as the exhaust is vented.
This is normal operation – no action is required.
The internal pump is not
running
1. No electrical supply
2. The capacitor is damaged.
3. Pump is blocked by debris or dirt.
1. Check the circuit breaker.
2. Replace the capacitor.
3. Use a screwdriver to rotate the rotor. Clean the
pump.
Pump or system noise
1. There is air in the system.
2. The inlet presssure is too low.
1. Bleed / purge air from the pump / system.
2. Increase the inlet pressure.
Table 31 - Troubleshooting Chart
DIAGNOSTICS AND SUGGESTED CORRECTIVE ACTIONS
The boiler control is able to record information about the boiler’s condition at the time of the ten previous faults or errors. This information is
available to view in the Installer Mode under the History screen.
The following screens may be displayed when reviewing the boiler history. The table below also includes diagnostic information and possible
corrective actions.
Display Condition Diagnostic Possible Corrective Actions
Nothing appears on the
display control panel
but the fan runs at full
speed
Control is not
receiving power
Check wiring for short circuit or incorrect
wiring
Correct wiring per wiring diagram including
connection of transformer to the control.
Check transformer connection to the
control per wiring diagram. Check for 12V
output of panel wire.
Push the Power button on the control panel.
Replace transformer if it is receiving 120V, but
not outputting 12 VAC.