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Causes And/Or Reasons For (2-blink) Shutdown:
The DVC-500 operates with a negative pressure
rebox as a safety feature. Any loss of this negative
pressure will start the safety protocol, ( A two blink
status warning )
The following list of potential reasons for warnings
is in order of most likely to least likely to occur:
1. Opening the viewing door or the ash door for
long periods of time without turning the feed adjuster
knob to the "ASH OUT" position.
2. Blocked or partially blocked ue pipe. This is
generally a slow buildup and may only cause the unit
to go in and out of Stage 1. Although as the condition
worsens, the unit will continue to step down until it
goes out.
3. Draft motor fan blades dirty. This is generally a
slow buildup and may only cause the unit to go in and
out of Stage 1. Although as the condition worsens, the
unit will Continue to step down until it goes out.
4. Draft motor fan cover plate not installed or not
in proper position. (Behind ash pan)
5. Gasketing problems with the viewing or ash
removal door.
6. Grate clean-out cover not closed properly,
Fig.26.
7. Grate inserts are extremely loose or out of align-
ment, g. 30.
8. Coal ash building up behind the ash pan to a
point where the ash door is sprung and not sealing
when latched.
9. Transparent tubing from rebox to sensing switch
is off or blocked with y ash.
10. Poor seal on the hopper lid (usually caused by
coal under hopper lid edge gasketing after fueling).
11. Fines tray cover not closed properly, g. 20.
12. Poor or improper ue termination, other than
those shown in the owners manual.
13. Too high of negative pressure in the area being
heated. This is usually caused by the area being too
tight and using many exhausting appliances ( range
hood, clothing dryer. exhaust fans, etc.). Often this
condition can be caused by heavy and gusting winds
hitting the outside, creating a negative pressure inside.
This internal to external pressure difference may
cause the unit to go in and out of Stage 1.
14. Faulty computer circuit or disconnected wiring
between control board and safety switch.
15. Faulty safety switch (not eld adjustable).
16. Draft motor failure - there is electricity to the
motor but it will not turn.
[At any time, the 2 blink status can be reset by
disconnecting the power to the unit for a few
seconds.]
DVC-500 Firebox Static Pressure Safety Protocol