Installation Manual

6
TROUBLESHOOTING
Burner Will Not Fire See Flow Chart 1, page 7
Burner Will Not Shut Down See Flow Chart 2, page 8
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 tankless coil, make sure the low limit setting on the HydroStat
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. If
installed with an indirect water heater, insure that the end switch in the relay box
controlling the indirect water heater is connected to the I1-I2 terminals. This will insure
that the domestic water calls are prioritized. (see “Heating-With Indirect Water Heater” on
page 3).
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, lowers 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 4).
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 burn-
er relay and then shuts down and locks out the burner until the temperature falls below
210°F. The system should be analyzed to determine the cause of the overheating condi-
tion. Check system wiring and operation as well as the controlʼs high limit setting. If the
cause of the overheating condition cannot be determined, the control should be replaced.
SMART DHW PRIORITY
During a call from an indirect water heater, the control will
de-energize the circulator contacts (C1/C2) to heat only the
indirect tank ensuring an adequate supply of domestic hot
water. The control will re-energize the circulator when the
indirect tank is satisfied or if the boiler temperature reaches
170°F. If the indirect call continues for 45 minutes, the control
will override the priority function energizing the circulator to
provide space heating.
During a call from the indirect, the economy feature will be
disabled allowing the boiler run to the high limit setting. That
operation is not subject to override after 45 minutes.