Grindmaster service manual American Metal Ware 87710E Coffee Urn

American Metal Ware 87710E Coffee Urn

Page 15

Problem		Possible Cause	Service Check	Remedy
C) Auto refill fails to fill	3) Water strainer		Water pressure before	Remove and clean micromesh
water tank (continued).	clogged.		strainer and not after.	screen filter located in water strainer.
	4)	No power on Dual	Check for 120V AC	If voltage missing or incorrect, check
	Level Control.		across “H” and “N” ter-	wiring for looseness, breaks, and
			minals.	proper connections.
	5)	Fill solenoid valve	Disassemble.	Clean out and/or replace plunger
	clogged with scale or			assembly or entire valve. May
	frozen closed.			require new coil. Caution is advised
				to avoid damage to valve. See valve
				instruction sheet.
	6)	Fill solenoid valve	Jumper from “FILL” ter-	Replace coil. Also check for frozen
	coil inoperative.		minal to “H” terminal	plunger. See valve instruction sheet.
			does not start fill.
	7)	Electrodes shorting	Tank fills with electrode	Replace electrode assembly. If no
	to ground.		wire disconnected from	remedy, check for improper wiring
			“HI” terminal.	(cut insulation) or electrode tips
				touching metal.
	8)	Dual Level Control	Tank does not fill with	Replace Dual Level Control.
	faulty.		electrode wire
			disconnected from
			“HI” terminal.
D) Auto Refill is erratic.	1) Electrode shorting to		Tank fills with electrode	Replace electrode assembly.
	ground completely or		wire disconnected from
	intermittently.		“HI” terminal.
	2)	Loose connection.	Visual. Check “C” and	Push wire lead connector securely
			“HI” probe terminals as	onto terminal(s). Replace connector
			well as “FILL”. Also	if wire is frayed or broken.
			check neutral (white)
			wire at valve.
	3)	Dual Level Control	Tank does not fill with	Replace Dual Level Control.
	faulty.		electrode wires discon-
			nected from “XL” and
			“H” terminals.

IV) Trouble Shooting Auto Refill, Low Water Cutoff, and Dual Level Control System (continued)