Troubleshooting
│
FTV I&O Manual
76
3)
Display Normal but no DHW
– perform the following steps:
FTV Combi:
o
Verify DHW Mode is set to 5 (Installer Menu setting 2-08).
o
Verify there is DHW flow – check
DHW flow rate
(User Menu reading 1-05); boiler goes to DHW mode
when the flow exceeds 0.3gpm. If flow is insufficient, check water supply and DHW piping; check Y-
strainer for blockage. Check wiring to flow sensor – replace flow sensor if necessary.
o
Compare
DHW setpoint
(User Menu reading 1-04) with
DHW temp
(User Menu reading 1-03); burner
fires immediately if the flow exceeds 0.3gpm. If necessary increase
DHW setpoint
(Installer Menu setting
2-07) – 120 to 140ºF recommended.
o
If the radiator symbol is flashing on the display, the
DHW priority time
may have expired. Cycle power
and consider increasing the
DHW priority time
(Installer Menu setting 2-09).
Indirect Tank with Tank Sensor:
o
Verify DHW Mode is set to 1 (Installer Menu setting 2-08).
o
Verify there is a Tank sensor wired to COMMON and DHW (boiler terminals 3 and 6), see Figure 12-2.
Tank sensor temperature,
DHW temp,
is viewed from User Menu reading 1-03.
o
Compare
DHW setpoint
(User Menu reading 1-04) with the
DHW temp
(User Menu reading 1-03). DHW
Tank demand is generated when the
DHW temp
drops 4ºF below the
DHW setpoint
; after which burner
demand starts when the boiler outlet temperature (displayed on Main Screen) drops below the
Current
target temp
(User Menu reading 1-01) by 15ºF.
Current target temp
for a DHW Tank demand is equal to
DHW setpoin
t + 40ºF; if necessary increase
DHW setpoint
(Installer Menu setting 2-07) – 130 to 140ºF
recommended.
o
If the radiator symbol is flashing on the display, the
DHW priority time
may have expired. Cycle power
and consider increasing the
DHW priority time
(Installer Menu setting 2-09) and/or
DHW setpoint
(Installer Menu setting 2-07).
o
If the faucet symbol is flashing on the display, verify the DHW circulator is operating – DHW circulator
should be wired to DHW PUMP and L2 NEUTRAL (boiler terminals 9 and 12/13); see Figure 12-2.
o
Verify plumbing is in accordance with Figure 10-4 or 10-4.
Indirect Tank with Tank Thermostat:
o
Verify DHW Mode is set to 2 (Installer Menu setting 2-08).
o
Verify there is a Tank thermostat wired to COMMON and DHW (boiler terminals 3 and 6), see Figure
12-2.
o
Verify there is a demand from the thermostat; when the demand is on,
DHW temp
(User Menu reading 1-
03) will indicate “CLOS” (or 242
⁰
F/117
⁰
C); when demand is off,
DHW temp
will indicate “OPEn” (or
14
⁰
F/-10
⁰
C). If uncertain about thermostat operation, place a jumper between terminals 3 and 6; the
faucet symbol will flash on display when there is a DHW demand.
o
Compare
DHW setpoint
(User Menu reading 1-04) with the boiler outlet temperature (displayed on Main
Screen); burner demand starts with the boiler outlet temperature drops below the
DHW setpoint
by 15ºF.
If necessary increase
DHW setpoint
(Installer Menu setting 2-07) – 160 to 190ºF recommended.
o
If the radiator symbol is flashing on the display, the
DHW priority time
may have expired. Cycle power
and consider increasing the
DHW priority time
(Installer Menu setting 2-09) and/or
DHW setpoint
(Installer Menu setting 2-07).
o
If the faucet symbol is flashing on the display, verify the DHW circulator is operating – DHW circulator
should be wired to DHW PUMP and L2 NEUTRAL (boiler terminals 9 and 12/13); see Figure 12-2.
o
Verify plumbing is in accordance with Figure 10-4 or 10-4.
4)
Display Normal but DHW is not hot enough
– perform the following steps:
Increase
DHW setpoint
(Installer menu setting 2-07):
o
FTV Combi (DHW Mode = 5) – recommended setting = 120 to 140ºF.
o
Indirect Tank with Tank Sensor (DHW Mode = 1) – recommended setting = 130 to 140ºF.
o
Indirect Tank with Tank Thermostat (DHW Mode = 2) – recommended setting = 160 to190ºF.
FTV Combi – DHW flow rate is too great; report
DHW flow rate
(User Menu reading 1-05) to NTI. If
necessary, restrict overall DHW flow rate.
Indirect Tank – verify plumbing is in accordance with Figure 10-6 or 10-7.
5)
Display indicates an error (Err), lockout (Loc) or warning (Att);
reference Table 17-3 in Section 17.0.
