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110891-02 -5/22
RSAH
Installation & Service Manual
Burner Will Not Fire
See Flow Chart 1
Burner Will Not Shut
Down
See Flow Chart 2
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 boiler equipped with a tankless coil, make sure the low limit setting on the HydroState is set
properly.
NOTE:
If the low limit setting is dialed fully clockwise, it will shut off the low temperature
maintenance feature and will function as a cold start control. If installed with an indirect water heater,
check that the Zone/Indirect Switch is set in the Indirect (
I
) position. Verify that the end switch in the
relay box controlling the indirect water heater is connected tothe
ZC/ZR
terminals. This will ensure
that the domestic water calls are prioritized. (See “Heating and Indirect Water Heater.)
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
TM
When the LOW WATER light in 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 protections and is currently locked out (see Manual Reset Low Water
Cut-Off). 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 immersion well,
this is false reading caused by a loss of continuity between the sensor and the inside of the well tube.
Follow steps 1 and 2 (above) to ensure that the metal sensor head is making good contact with the
inside surface of the copper well.
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, from
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”).
Circulator Contacts C1
and C2 Not Energized
on Call for Heat
Check to see that boiler water is at or above 125
o
F. On a call for heat, the control will not permit the
circulator to operate if the boiler water temperature is below 125
o
F (see “Circulator Hold Off”).
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
o
F. When this occurs, the control pulses the burner relay and then
shuts down and lock-out the burner. The system should be analyzed to determine the cause of the
overheating condition. Check that the sensor in 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 repowering 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.
11
Troubleshooting
(continued)
