when tubes get plugged with ash heat cant get out of heater

Heater Cleaning Schedule
5000 Clean Burn - clean out every 500 hours.
500 Shenandoah - clean out every 500 hours.
350 Reznor - clean out every 250 hours.
3500 Clean Burn  - clean out every 500 hours.
350 Shenandoah - clean out every 500 hours.
350 Clean Burn - clean out every 500 hours.
350 Omni - clean out every 250 hours.
320 Lanair HI - clean out every 500 hours.
315 Shenandoah Horizon - clean out every 250 hours.
300MX Lanair - clean out every 500 hours.
2800 Clean Burn - clean out every 500 hours.
280,000 Clean Burn - clean out every 500 hours.
2500 Clean Burn - clean out every 500 hours.
235 Reznor - clean out every 250 hours.
225 Reznor Venturion - clean out every 250 hours.
260 Lanair HI - clean out every 500 hours.
250 Omni - clean out every 250 hours.
235 Shenandoah - clean out every 500 hours.
200 Shenandoah Horizon - clean out every 250 hours.
200MX Lanair - clean out every 500 hours.
185 Clean Burn - clean out every 500 hours.
1800 Clean Burn - clean out every 500 hours.
175,000 Clean Burn - clean out every 500 hours.
175 Shenandoah - clean out every 500 hours.
155 Shenandoah Horizon - clean out every 250 hours.
140 Reznor - clean out every 250 hours.
1400 Clean Burn - clean out every 250 hours.
140,000 Clean Burn - clean out every 250 hours.
140,000 Lanair - clean out every 500 hours.
125 Shenandoah - clean out every 500 hours.

All other heaters get cleaned out every 250 hours.
How To Figure Clean-out Times if No Hour Meter

Divide BTUs (of heater size) by 140,000 (BTUs of heat per gallon of oil), and multiply that by how number of hours between clean outs (250 or 500) and you will have how often you should clean out your furnace in gallons of oil burnt.
Example:  280,000 (BTU heater) ÷ 140,000 (BTUs per gallon) = 2 (gallons of oil per hour).  Multiply this by 500, and you should clean out your furnace every 1,000 gallons.
top tubes are plugged with ash and bottom tubes are covered over
when tubes get plugged with ash heat cant get out of heater
picture is turned 90 degree counter clock wise
ash is completely jam packed and covers tubes
don't forget your nozzle
it may be worn out look
closely at nozzles &            click on pix