INSTALLATION AND OPERATION INSTRUCTIONS
5-10
VFC 15-150, VFC 45-225 MODULATING GAS BOILERS
5.3.5 Miscellaneous
SYMPTOM
DIAGNOSIS
REMEDY
FUMES AND HIGH HUMIDITY
Improperly installed
condensate trap
Refer to installation/operation instructions
Leak in vent piping
Inspect using soap solution
Flue gas leak within
boiler
Visually inspect all mechanical connections
BOILER STUCK ON INITIALIZE
Fan board failure
Replace fan.
TOUCH SCREEN MESSAGE:
Unknown Error
Temperature sensor
input problem.
Test each temperature sensor for appropriate
readings and replace defective temperature
sensor.
ERROR: WATER HIGH LIMIT /
LOW WATER CUT-OFF WON’T
CLEAR.
Boiler is in 1 hour
safety lockout.
Reset safety device and cycle boiler power off
and on to reset error.
DHW TAKING TOO LONG TO
HEAT.
Sensor may be under-
reading actual water
temp.
Check sensor engagement; note well is 15cm /
almost 6 inches deep and sensor must be fully set
to back. Check programmed settings boiler temp
set too close to the required DHW temp
BOILER OUTPUT NOT
MODULATING UP TO
MAXIMUM DESPITE TARGET
NOT BEING REACHED.
Possible flow issue:
check for 35 or 40
degree F temperature
difference between
boiler supply and return
water temperatures
(evokes electronic
fence).
Confirm that primary pump is able to overcome
head loss of boiler and primary loop piping at the
required flow rate.
PRIMARY PUMP RUNS
DURING PARALLEL-PIPED
DHW CALL.
Load definition as DHW.
On Touch Screen Controllers set the boiler pump
to off in the Installer Set-up Menu.
Summary of Contents for VFC 15-150
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