12.3.3
Solutions
Remove the memory card and replace with the original
memory card from the furnace or the correct replace-
ment memory card.
Never replace the memory card of
a furnace with a memory card from another furnace
or component (e.g. condenser or air handler). Doing
so could result in improper operation of the blower
which may cause damage to the heat exchanger.
If
the original memory card for the furnace control is avail-
able and working, it must be used. A correct replacement
memory card can be ordered. Be sure to have the fur-
nace model and serial number available when ordering.
12.4
D6
12.4.1
Description
The horsepower reported by the motor does not match
the horsepower stored in memory in the shared data of
the memory card or furnace control.
12.4.2
Causes
A motor manufactured by a non-supported OEM and/or
an invalid memory card is used to replace the blower mo-
tor.
12.4.3
Solutions
1. Replace the blower motor with a supported motor
2. Replace the memory card
Never replace the memory card of a furnace with
a memory card from another furnace or component
(e.g. condenser or air handler). Doing so could re-
sult in improper operation of the blower which may
cause damage to the heat exchanger.
12.5
h - no modulation
12.5.1
Description
When the lower-case “h” is displayed at the furnace con-
trol, it indicates that the furnace is operating in heat mode
and providing heat but the modulation function has been
compromised. Two stages or even three-stage operation
is possible (through a timed algorithm) but full modulation
will not be possible.
12.5.2
Causes
The modulating “V” signal cannot be sensed by the fur-
nace control. This may be OK if either a traditional single
stage or two stages, non-communicating thermostat is
used with a modulating furnace. If this is the case, the
lower case “h” is normally displayed during heating op-
eration and does not indicate abnormal operation. How-
ever, if a fully modulating, non-communicating thermostat
is used and this message is displayed. It indicates the
furnace control is not sensing the modulating “V” signal
from the thermostat. A lower-case “h” should never be
displayed during any operation with a fully communicat-
ing thermostat or modulating thermostat.
12.5.3
Solutions
If a single stage or two stage, non-communicating ther-
mostat is used, this operation is normal and no action
needs to be taken. However, if the thermostat is fully
modulating and non-communicating, the “V” signal is not
being sensed by the furnace control. The connection (in-
cluding wiring, wire nuts and etc.) should be checked
first. If the connection is correct and OK, check the ther-
mostat and then the furnace control.
12.6
10 - Furnace lock-out
12.6.1
Description
This fault is displayed after four failed ignition attempts.
After four attempts to ignite without success, the furnace
control goes into a lockout mode and will not attempt ig-
nition again for one hour.
12.6.2
Causes
1. Unable to sense flame. It may need cleaning or
may not be properly connected.
2. The igniter is not working properly. It may not be
properly connected or the spark location may not
be correct.
3. The furnace control may not be working properly
and may need to be replaced.
4. The flame may not be properly spreading from the
first burner to the last.
12.6.3
Solutions
Solution depends on the cause. Solution to noted causes
above are:
41
Summary of Contents for Chinook C105-M-V
Page 24: ...Figure 10 Typical gas pipe arrangement 23...
Page 27: ...Figure 11 Wiring Diagram 26...
Page 39: ...Figure 14 Wiring Diagram Modulating t stat 38...
Page 53: ...Table 17 CFM 52...
Page 54: ...Figure 15 Dimensional Drawing 53...
Page 55: ...14 PART LIST 54...
Page 56: ...Figure 16 Exploded view 1 55...
Page 57: ...Figure 17 Exploded view 2 56...
Page 59: ...Table 19 Parts list continued 58...
Page 60: ...Table 20 Parts list MS 59...
