12
MAINTENANCE
TROUBLESHOOTING
Remove the Electro-Well
™
from the heating system every five years and clean any scale or sediment deposits from all parts that
are exposed to the boiler water. After cleaning, reinstall the well using pipe sealing compound. Teflon tape is not recommended.
Burner Will Not Fire
See Flow Chart 1, page 13
Burner Will Not Shut Down
See Flow Chart 2, page 14
Temperature Display Exceeds
High Limit Setting
Under normal operation, boiler temperature will continue to rise after the control shuts off
the burner. This condition, known as “thermal stacking”, results from hot boiler surfaces
continuing to release heat into the boiler water.
No or Insufficient
Domestic Hot Water
For boilers equipped with a plate heat exchanger, make sure the low limit setting on the Hy-
droStat is set properly. NOTE: If the low limit setting is dialed fully counter clockwise, it will
shut off the low temperature maintenance feature and will function as a cold start control.
Pulsing Hot Water
Pulsing warm water means the Ascent Combi is pre-heating. This takes about two minutes
from cold start before hot water starts flowing continuously through hot water piping. Puls-
ing could also indicate the domestic water flow rate is too high and the boiler is in conden-
sation protection mode. Reduce domestic flow rate to allow the boiler to reach operating
temperature, or increase the firing rate if desired.
Low Water Light
(Red LED) is On
or Blinking
WARNING: A low water condition is a serious and potentially
dangerous condition. Do not attempt to add water to a hot boiler.
Allow the boiler to fully cool before adding water.
When Installed on an Electro-Well™
When the LOW WATER light is on, this indicates that the control is not detecting water in
the boiler. When the LOW WATER light is blinking, this indicates that the control has been
programmed to provide low water lock-out protection and is currently locked out (see Man-
ual Reset Low Water Cut-Off on page 9). Pressing the TEST/SETTINGS button after the low
water condition is resolved will reset the lock-out condition.
1. If the light is on and the heating system is filled with water, pull the sensor out of the well
and inspect it. Make sure that the metal clip is protruding enough to come in contact with
the inside of the well tube. Check that the well does not have excessive build-up of heat
transfer grease that may interfere with the clip contacting the well.
2. Remove well and examine for excessive residue build-up. Clean and re-install.
When Installed on a Standard Immersion Well
If either LWCO LED lights are illuminated and the control is installed on a standard immer-
sion well, this is a false reading caused by a loss of continuity between the sensor and the
inside of the well tube. It is recommended when the control is installed on a standard immer-
sion well, the LWCO Function be turned off (see page 9 for details).
Boiler Will Not Maintain
Low Limit Temperature
Check for overlapping high temperature setting. If the high limit setting is set below the low
limit setting, the control will default to the high limit setting and the corresponding high limit
differential setting.
House Will Not Get
or Stay Warm
1. Check for air-bound radiators.
2. Check thermostat settings including heat anticipator settings (common on non-digital
thermostats).
3. Check the Economy setting. The Economy feature, much like outdoor reset controls, low-
ers average boiler temperature and can slow or, in some cases, prevent the house from
coming up to temperature. Move to a lower setting (see “Setting the Economy Feature”
on page 7).
All LED Lights and Temp
Display are Blinking
If the LED lights and the temp display are blinking alternately, this indicates the control has
sensed a boiler temperature of 250°F. When this occurs, the control pulses the burner relay
and then shuts down and locks-out the burner. The system should be analyzed to determine
the cause of the overheating condition. Check that the sensor is inserted all the way into
the well so it can accurately sense the temperature of the boiler water. Check the load on
the burner contacts: If the load exceeds the 7.4 Amp rating, the contacts may have welded.
Correct the overloading condition and replace the control before reenergizing the system.
If the load on the contacts is below the rating, check system wiring and operation as well
as the control’s high limit setting. If the cause of the overheating is found and the system
is deemed safe, the control can be reset by removing power from the control and then re-
powering while simultaneously pressing the Test/Settings button on the top of the control. If
the cause of the overheating condition is not determined, the control should be replaced.
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