5-8
• Insufficient or no water flow. Determine if water is being delivered to
and returned from the furnace at the proper pressure and flow as specified
in Section 1.3.7.
Typical Causes – Lid Related
• Lid latching mechanism incorrectly adjusted. Refer to Section 5.2.3.
• Foreign object left on chamber sealing flange. The chamber and lid when
properly adjusted fit so close together that even a piece of paper or small
piece of tape will prevent the latches from fully engaging the strike pins.
• Defective lid latch switch. Referring to the “Chamber Assembly”
pictorial drawing, locate item 23. The switches cannot be adjusted; if
inoperable for any reason they must be replaced.
Danger! The lid latch switches are absolutely essential to ensure that the lid is
fully locked before pressure can be applied. Do not defeat, modify or replace
either switch with anything except SST # 35256. Partially engaged latches could
allow the lid to open under pressure, causing serious injury.
5.2.5 Heat Related Problems
No Heat – Temperature does not increase when program calls for heat.
Typical Causes
• Failed heating element. Refer to 5.3.1 and replace the element.
• Blown fuse. Check 3FU.
• Blown fuse. Check 1FU, 110-volt models, 1&2FU, 220-volt models.
See fuse table in Section 6 for fuse type and rating.
• Defective solid-state power relay. Check 1SSR.
• Defective control relay. Check 1CR.
• Insufficient vacuum, 220-volt models only. Refer to 5.2.1.
Continuous Heating – Temperature continues to increase past temperature
setpoint.
Typical Causes
• PID parameters improperly adjusted. See “Manual Tuning Procedure” on
page 3.5 of Series F4 User’s manual.
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